【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(dāng)我媽媽在洗衣服的時候,我在做作業(yè)。

考查連詞,A. because因?yàn)椋?/span>B. before...以前 ;C. while當(dāng)...的時候 ;D. after...之后。根據(jù)“was doing”和“was washing”可知,這一句是過去進(jìn)行時,能表示同時進(jìn)行的兩件事的介詞,只有while,故選C。

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