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【题目】_____your homework before you watch TV.

A. Do B. Doing

C. To do D. Done

【答案】A

【解析】分析句子,由于这是一个由before引导的时间状语从句,可知空格的词要充当主句的谓语动词,而主句应该是一个祈使句。根据句意,可知选A。句意:在你看电视之前要完成作业。

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