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    【题目】You can’t use the computer now, ________ the upgrade of the system is under way.

    A. untilB. unless

    C. asD. after

    【答案】C

    【解析】

    考查状语从句的连词。句意：你现在不能用电脑，因为系统正在升级。A. until 直到；B. unless 除非；C. as 因为，当……的时候；D. after 在……之后。本题是一个原因状语从句，故选C。

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