【題目】When Jim'S mother came in，he________his homework．

A. is doing B. has done

C. was doing D. had done

【答案】C

【解析】

試題分析：根據(jù)句意：當(dāng)Jim的媽媽進(jìn)來時(shí)，他正在做他的作業(yè)。when”當(dāng)……時(shí)候“引導(dǎo)時(shí)間狀語從句，表示當(dāng)一個(gè)動(dòng)作發(fā)生時(shí)，另一個(gè)動(dòng)作同時(shí)發(fā)生，從句為一般過去時(shí)，主句用過去進(jìn)行時(shí)，故選C。

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