【題目】I don’t know what he _______when Mr.Wu came in .

A. was doing B. has done C. is doing D. would do

【答案】A

【解析】

句意：我不知道當(dāng)吳老師進(jìn)來(lái)的時(shí)候他正在做什么。was doing正在做，過(guò)去進(jìn)行時(shí)；has done已經(jīng)做了，現(xiàn)在完成時(shí)；is doing現(xiàn)在進(jìn)行時(shí)；would do過(guò)去將來(lái)時(shí)。根據(jù)句意when Mr. Wu came in可知，這里表示過(guò)去正在發(fā)生的動(dòng)作，應(yīng)用過(guò)去進(jìn)行時(shí)態(tài)，故選A。

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