【題目】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】

考查狀語從句的連詞。句意：你現(xiàn)在不能用電腦，因為系統(tǒng)正在升級。A. until 直到；B. unless 除非；C. as 因為，當(dāng)……的時候；D. after 在……之后。本題是一個原因狀語從句，故選C。

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