【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……的時候”，句意:今天杰克遜已經(jīng)完成了他的工作嗎?——我不知道,但是當我今天早晨看見他時他正在做。結(jié)合語境可知下文描述的是在過去某個時間正在進行。故用過去進行時，選D。

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