*566To qualify for special rule cancellation of removal under the Nicaraguan Adjustment and Central American Relief Act (NACARA),1 an undocumented immigrant must show he has been "physically present in the United States for a continuous period of not less than 10 years immediately following the commission of an act, or the assumption of a status, constituting a ground for removal." NACARA § 203(b); see 8 C.F.R. § 1240.66(c)(2). When Manuel Campos-Hernandez applied for NACARA special rule cancellation, the BIA interpreted the physical presence requirement as running from Campos-Hernandez's most recent disqualifying conviction, rather than his earliest, and so held him ineligible for NACARA cancellation of removal. We conclude that the BIA's interpretation of NACARA is reasonable and is therefore entitled to deference. Accordingly, we deny the petition.
I
Campos-Hernandez, a citizen and native of El Salvador, entered the United States in 1990 or 1991 without being admitted or paroled after inspection by an immigration officer. He is 41 years old and married to a U.S. citizen. Since 2009, he has worked as a mechanic. Campos-Hernandez was convicted of drug-related offenses in California in 2003, 2005, and 2008.
In 2008, the Department of Homeland Security (DHS) served Campos-Hernandez with a Notice to Appear (NTA) at a removal hearing. The NTA alleged that Campos-Hernandez arrived in the United States without being admitted or paroled after inspection, and charged him with removability both on that basis and on the basis of his drug convictions.2 Campos-Hernandez admitted the allegations against him and conceded his removability.
On February 10, 2012, Campos-Hernandez filed a NACARA application. That same day, an immigration judge (IJ) found that Campos-Hernandez was ineligible for NACARA special rule cancellation of removal and denied his application for relief. Specifically, the IJ determined that, because the drug convictions rendering him inadmissible occurred within the previous ten years, Campos-Hernandez could not satisfy NACARA's requirement of "10 years [of continuous physical presence] immediately following the commission of an act, or the assumption of a status constituting *567a ground for removal." 8 C.F.R. § 1240.66(c)(2).
The BIA dismissed Campos-Hernandez's appeal in a non-precedential, single-member opinion. The opinion held that Campos-Hernandez's 2008 conviction was "a ground for removal" under 8 C.F.R. § 1240.66(c)(2), and because ten years had not elapsed between 2008 and the decision of the BIA, he was not eligible for cancellation of removal under NACARA. Campos-Hernandez timely filed a petition for review.
After the briefing of this appeal, a three-member panel of the BIA held, in a precedential opinion in a different immigration appeal, that "for purposes of special rule cancellation of removal under the NACARA, ... continuous physical presence should be measured from the alien's most recently incurred ground of removal." Matter of Castro-Lopez , 26 I. & N. Dec. 693, 696 (BIA 2015) (emphasis added). We ordered the parties to submit supplement briefing addressing Matter of Castro-Lopez , and they did so.
II
A. Applicable law
NACARA was enacted in 1997 to provide immigration benefits to nationals from certain Central American and Eastern European countries, including El Salvador. See NACARA § 203(b);3 8 C.F.R. § 1240.61(a) ; Barrios v. Holder , 581 F.3d 849, 857 (9th Cir. 2009). In particular, "[s]ection 203 of NACARA allows qualified individuals to apply for special rule cancellation under the more lenient standards that existed before the passage of [IIRIRA]." Barrios , 581 F.3d at 857.
Most applicants for cancellation of removal under NACARA must establish physical presence in the United States for "a continuous period of 7 years immediately preceding" the filing of an application for cancellation of removal. NACARA § 203(b); 8 C.F.R. § 1240.66(b)(2). An applicant for cancellation of removal under NACARA who is inadmissible under 8 U.S.C. § 1182(a)(2),4 however, is subject to a heightened physical presence requirement. Such an applicant, like Campos-Hernandez, must establish that he "has been physically present in the United States for a continuous period of not less than 10 years immediately following the commission of an act, or the assumption of a status, constituting a ground for removal." NACARA § 203(b); 8 C.F.R. § 1240.66(c)(2).
"Agency regulations interpreting special rule cancellation"-particularly the continuous physical presence requirements-"closely track the text of ... NACARA." Barrios , 581 F.3d at 857 ; see 8 C.F.R. § 1240.66(b)(2), (c)(2). In turn, the language of NACARA's continuous physical presence requirements-both the "heightened" ten-year requirement and the regular seven-year one-is copied from an older statute governing suspension of deportation, a now-superseded form of immigration *568relief.5 See 8 U.S.C. § 1254 (1996) (repealed); Fong v. INS , 308 F.2d 191 (9th Cir. 1962) (construing identical language from the now-superseded suspension of deportation statute).
An agency's formal interpretation of its governing statutes may be entitled, when appropriate, to deference under Chevron, U.S.A., Inc. v. Nat. Res. Def. Council, Inc. , 467 U.S. 837, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984). Chevron deference is appropriate when "it appears that Congress delegated authority to the agency generally to make rules carrying the force of law, and ... the agency interpretation claiming deference was promulgated in the exercise of that authority." United States v. Mead Corp. , 533 U.S. 218, 226-27, 121 S.Ct. 2164, 150 L.Ed.2d 292 (2001) ; see Marmolejo-Campos v. Holder , 558 F.3d 903, 908 (9th Cir. 2009) (en banc). When applying Chevron , a court "is confronted with two questions. First ... is the question whether Congress has directly spoken to the precise question at issue. If the intent of Congress is clear, that is the end of the matter." Chevron , 467 U.S. at 842, 104 S.Ct. 2778. However, "if the statute is silent or ambiguous with respect to the specific issue, the question for the court is whether the agency's answer is based on a permissible construction of the statute." Id. at 843, 104 S.Ct. 2778. An agency's interpretation that conflicts with earlier binding authority of this court is entitled to deference unless the court's earlier interpretation "follows from the unambiguous terms of the statute and thus leaves no room for agency discretion." Nat'l Cable & Telecommc'ns Ass'n v. Brand X Internet Servs. , 545 U.S. 967, 982, 125 S.Ct. 2688, 162 L.Ed.2d 820 (2005) ; see also Garfias-Rodriguez v. Holder , 702 F.3d 504, 512-13 (9th Cir. 2012) (en banc).
B. Discussion
1. Conflicting authority and Brand X
Before determining whether the BIA's interpretation in Matter of Castro-Lopez merits deference, we confront a threshold issue: whether we are bound by our contrary interpretation of the now-superseded suspension of deportation statute. See Fong , 308 F.2d 191. Fong addressed a continuous physical presence provision identical to the one we here examine.
In Fong , Louie King Fong's eligibility for suspension of deportation hinged, as does Campos-Hernandez's, on whether the ten-year physical presence requirement ran from when he first became deportable in 1944, or from the last act or status making him deportable, which occurred in 1953. Id. at 193. If the former, Fong "ha[d] been physically present in the United States for a continuous period of not less than ten years immediately following ... the assumption of a status ... constituting a ground for deportation." Id. at 194 (quoting 8 U.S.C. § 1254(a) (1952) ). If the latter, he had not. Finding the provision "open to two possible constructions," id. , the court likened the provision to a penal statute, and resolved the ambiguity by strictly construing the statute in favor of Fong. Id. at 194-95 (citing Barber v. Gonzales , 347 U.S. 637, 642-43, 74 S.Ct. 822, 98 L.Ed. 1009 (1954) ). Accordingly, the court held that Fong's residence in the United States, dating *569from his first deportable act or status in 1944, satisfied the ten-year continuous physical presence requirement, notwithstanding his later-incurred grounds for deportation. Id. at 195-96.
NACARA-the statute we address today-is not the same suspension of deportation statute construed in Fong . In enacting NACARA, however, Congress purposely used language identical to that in the suspension of deportation statute, as it intended to preserve the remedy from that statute for NACARA beneficiaries. See Munoz v. Ashcroft , 339 F.3d 950, 955 (9th Cir. 2003). For that reason, our interpretation of the provision in Fong would arguably still bind us, notwithstanding the formal non-identity of the two statutes, but for the BIA's recent precedential interpretation of the provision in Matter of Castro-Lopez .
Fong does not, however, prevent us from deferring to Matter of Castro-Lopez . "Only a judicial precedent holding that the statute unambiguously forecloses the agency's interpretation, and therefore contains no gap for the agency to fill, displaces a conflicting agency construction." Brand X , 545 U.S. at 982-83, 125 S.Ct. 2688. Fong expressly determined that the ten-year physical presence requirement was "open to two possible constructions." Fong , 308 F.2d at 194 ; see id. at 195-96 ("[W]e will not assume that Congress meant to trench on [Fong's] freedom beyond that which is required by the narrowest of several possible meanings of the words used.") (emphasis added) (quoting Fong Haw Tan v. Phelan , 333 U.S. 6, 10, 68 S.Ct. 374, 92 L.Ed. 433 (1948) ). As Fong did not hold that the Immigration and Nationality Act "unambiguously foreclose[d]" a contrary interpretation, our decision in that case may not "displace[ ] a conflicting agency construction" otherwise entitled to deference. Brand X , 545 U.S. at 983, 125 S.Ct. 2688.
2. Matter of Castro-Lopez
We next determine whether the BIA's interpretation of the ten-year continuous physical presence requirement in Matter of Castro-Lopez is entitled to deference.
As a preliminary matter, we conclude that Matter of Castro-Lopez involved the interpretation of a statute, not a regulation. In Matter of Castro-Lopez , the BIA said that it was interpreting 8 C.F.R. § 1240.66(c)(2), a regulation implementing NACARA § 203(b), rather than § 203(b) itself. See 26 I. & N. Dec. at 696 (citing Auer v. Robbins , 519 U.S. 452, 461, 117 S.Ct. 905, 137 L.Ed.2d 79 (1997) ). In general, an agency's interpretation of its own ambiguous regulation is subject to " Auer deference." See Price v. Stevedoring Servs. of Am., Inc. , 697 F.3d 820, 828-29 (9th Cir. 2012) (en banc). When, however, "the underlying regulation at issue [does] 'little more than restate the terms of the statute itself[,]' ... the question [is] really one of statutory interpretation." Id. at 829 (quoting Gonzales v. Oregon , 546 U.S. 243, 257, 126 S.Ct. 904, 163 L.Ed.2d 748 (2006) ).
The language of 8 C.F.R. § 1240.66(c)(2) copies verbatim the relevant statutory text of NACARA § 203(b).6 Rather than specifying whether the ten-year period begins with the first qualifying act or status or the last one, the regulation "incorporates the very [gap] ... the [agency] seeks to clarify."
*570Christopher v. SmithKline Beecham Corp. , 635 F.3d 383, 394 (9th Cir. 2011).
The language of § 1240.66(c)(2) thus "comes [directly] from Congress, not the Attorney General," so "the question ... is not the meaning of the regulation but the meaning of the statute." Gonzales , 546 U.S. at 257, 126 S.Ct. 904. The regulation's "parroting" of the statute, id. , is all the more conspicuous given that NACARA § 203(b) itself borrowed the precise language from statutes dating back at least to 1952. See 8 U.S.C. § 1254(a) (1952) (repealed). Accordingly, we assess whether Matter of Castro-Lopez is a permissible interpretation of the statutory text of NACARA § 203(b), rather than the regulatory text of 8 C.F.R. § 1240.66(c)(2).
The BIA's interpretation of the ten-year physical presence requirement in Matter of Castro-Lopez merits deference under Chevron . First, as noted above, § 203(b) of NACARA is "silent or ambiguous with respect to" the issue presented here: which act or status constituting a ground for removal-the first, last, or any other-starts the clock for the ten-year "heightened" physical presence requirement. Anaya-Ortiz v. Holder , 594 F.3d 673, 677 (9th Cir. 2010) (quoting Chevron , 467 U.S. at 842, 104 S.Ct. 2778 ).7
Next, Matter of Castro-Lopez is a "published BIA case" that constitutes "binding agency precedent on-point" that fills the interpretive gap. See id. (quoting Park v. Holder , 572 F.3d 619, 623-24 (9th Cir.2009) ); Matter of Castro-Lopez , 26 I. & N. Dec. at 696.
Finally, the BIA's interpretation of the ten-year physical presence requirement is reasonable. See Garfias-Rodriguez , 702 F.3d at 513. The statute requires ten years' continuous physical presence immediately following "the commission of an act, or the assumption of a status, constituting a ground for removal," NACARA § 203(b) (emphasis added), not "the act," or "the status," that constitutes a ground for removal. The indefinite article grants the words "act" and "status" an "indefinite or generalizing force," rather than "particulariz[ing]" them, Gale v. First Franklin Loan Servs. , 701 F.3d 1240, 1246 (9th Cir. 2012), as use of the definite article would have, to denote a specific act or status constituting a ground for removal. See also Black's Law Dictionary 1 (6th ed. 1990) ("The article 'a' is not necessarily a singular term; it is often used in the sense of 'any'...."). It is thus reasonable to interpret the requisite ten-year period to immediately follow each disqualifying act or status, rather than to follow a single particularized act or status-the first one, as Campos-Hernandez would read the statute.
Reading the continuous physical presence requirement to run from the last act or status, rather than the first, avoids consequences that would frustrate the evident policy behind the requirement. For example, under the opposite reading, an applicant who was convicted of a drug offense in 2000, but not again until 2010, could thereafter accumulate any number of disqualifying convictions and statuses while still remaining eligible for cancellation of removal under NACARA. The ten-year crime-free requirement would then serve a perverse purpose, as the individuals most *571likely to continue committing crimes, as evidenced by their very recent behavior, would be eligible to stay in the country, but individuals who had not committed any crime for eight or nine years would not. Such a result would severely undermine the "testing" or "qualifying" role of the physical presence provision. Patsis v. INS , 337 F.2d 733, 740 (8th Cir. 1964) (Blackmun, J.); Matter of V-R- , 9 I. & N. Dec. 340, 344 (BIA 1961), rule reinstated by Matter of Wong , 13 I. & N. Dec. 427 (BIA 1969).
Bolstering our conclusion, several circuits (and the BIA) have interpreted the same phrase in the suspension of deportation statute, 8 U.S.C. § 1254(a) (1952) (repealed), to date from the last deportable offense or status. See, e.g. , Patsis , 337 F.2d at 740-42 ; Matter of Wong , 13 I. & N. Dec. at 430.8 Fong itself recognized that the BIA's construction of the phrase "might find support in logic," 308 F.2d at 195, even though it ultimately resolved the ambiguity in favor of the petitioner.
We are mindful that NACARA was enacted to help people "who had taken unusual risks in escaping from oppressive governments," and those "whose countries had been profoundly ravaged by war." Ram v. INS , 243 F.3d 510, 517 (9th Cir. 2001). But NACARA's humanitarian purpose does not override the BIA's authority to interpret ambiguous provisions of the statutes that govern it. The reasonableness of the BIA's interpretation, along with the weight of authority supporting it, compel the conclusion that the BIA's interpretation is not "arbitrary, capricious, or manifestly contrary to the statute." Garcia v. Holder , 659 F.3d 1261, 1266 (9th Cir. 2011) (quoting Chevron , 467 U.S. at 844, 104 S.Ct. 2778 ).
We therefore defer to Matter of Castro-Lopez 's interpretation of NACARA § 203(b) as requiring that the ten-year continuous physical presence requirement for NACARA applicants run from the most recent "commission of an act, or ... assumption of a status, constituting a ground for removal." Campos-Hernandez was convicted of a drug-related offense in June 2008, rendering him inadmissible under § 212(a)(2) of the INA, 8 U.S.C. § 1182(a)(2)(A)(i)(II). Because he cannot establish that he has been "physically present in the United States for ... not less than 10 years immediately following the commission of an act, or the assumption of a status, constituting a ground for removal," he is not eligible for special rule cancellation of removal under NACARA.
The petition is DENIED.