【題目】—What were you doing at that time?
—I was in my room __________ my homework.
A.do
B.to do
C.did
D.doing

【答案】D
【解析】根據(jù)題干問(wèn)句可知本句為過(guò)去進(jìn)行時(shí)態(tài)，答語(yǔ)應(yīng)為過(guò)去進(jìn)行時(shí)，故選D。

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