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

A.becauseB.beforeC.whileD.after

【答案】C

【解析】

句意:當我媽媽在洗衣服的時候,我在做作業(yè)。

考查連詞,A. because因為;B. before...以前 C. while...的時候 ;D. after...之后。根據“was doing”和“was washing”可知,這一句是過去進行時,能表示同時進行的兩件事的介詞,只有while,故選C。

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