【題目】— Has Tom finished his homework?
— Sorry, I don't know. He ________ it this morning when I saw him.
A.did
B.does
C.has done
D.was doing

【答案】D
【解析】when“當(dāng)……的時(shí)候”，句意:今天杰克遜已經(jīng)完成了他的工作嗎?——我不知道,但是當(dāng)我今天早晨看見(jiàn)他時(shí)他正在做。結(jié)合語(yǔ)境可知下文描述的是在過(guò)去某個(gè)時(shí)間正在進(jìn)行。故用過(guò)去進(jìn)行時(shí)，選D。

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