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    【题目】China is playing a key role in controlling the virus. However, it will take long and much effort ________ it is under control.

    A.untilB.afterC.beforeD.unless

    【答案】C

    【解析】

    考查连词辨析。句意：中国在控制病毒方面发挥着关键作用。 但是，需要很长时间并付出很大努力才能控制住它。A. until直到……时；B. after在……之后；C. before在……之前，在（一段时间 ）之后才……；D. unless除非，如果不。before的基本含义是“在……之前”，又可以根据不同语境灵活翻译成 “才”、“还没来得及就……”、“就”等。before在这里引导时间状语从句，可译为“才”。故选C。

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