Once ______ by the expert, the girl will improve her English in a few months.A.being taughtB.to be taughtC.taughtD.teaching
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C解析本题考查状语从句的省略。该部分补充完整是：Once he was taught。连词when, while, if, as, though / although, until, once, whether, unless, where等引导的状语从句中，当主句的主语和从句的主语一致时，常省略跟主句相同的主语和be，只剩下主要的部分。