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You can't watch TV _______ you finish your homework.
A．beforeB．if
C．whileD．as
A

試題分析：句意：在你做完作業(yè)之前不可以看電視。A. before“在……之前”；B. if“如果”；C. while“當……時候”；D. as“像……一樣”。結合句意，故選A。
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