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You can't watch TV _______ you finish your homework.

A.before B.if
C.while D.as

A

解析试题分析:句意:在你做完作业之前不可以看电视。A. before“在……之前”;B. if“如果”;C. while“当……时候”;D. as“像……一样”。结合句意,故选A。
考点:考查连词的辨析。

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