This article explores the degree to which second language (L2) speakers of French acquire the semantic and pragmatic (or interpretive) properties associated with the c'est-cleft, specifically the exhaustive inference. This phenomenon is pertinent to theories of language acquisition as it is situated at the interface of syntax and pragmatics. The results from a forced-choice task defy the empirical adequacy of the interface hypothesis (Sorace, 2011, 2012; Sorace & Filiaci, 2006), which asserts that external interfaces between a linguistic module and a cognitive module stay problematic even at the highest levels of L2 acquisition. The results from 40 L2 learners at three competence levels disclose evolution from nontargetlike to nativelike behavior. Especially, the high-proficiency group interprets the c'est-cleft, as well as canonical subject–verb–object sentences and sentences with exclusives (i.e., seul(ement) “only”), in a statistically identical way to the French native speaker control group.