【題目】-When did the computer crash?

-This morning, while I __________ the reading materials downloaded from some websites.

A. have sorted B. was sorting

C. am sorting D. had sorted

【答案】B

【解析】表示一個(gè)動(dòng)作正在進(jìn)行，另一個(gè)動(dòng)作發(fā)生，用過去進(jìn)行時(shí)。

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【題目】C

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