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【题目】I was doing my homework ________my mother was washing clothes.

A.becauseB.beforeC.whileD.after

【答案】C

【解析】

句意:当我妈妈在洗衣服的时候,我在做作业。

考查连词,A. because因为;B. before...以前 C. while...的时候 D. after...之后。根据“was doing”和“was washing”可知,这一句是过去进行时,能表示同时进行的两件事的介词,只有while,故选C

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