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 ---Did you notice someone enter the classroom just now?
---Sorry, I didn’t. I _____ my lessons at that time.

A.am doing B.did
C.do D.was doing

D

解析试题分析:句意:--- 刚才你注意到有人进教室了吗?---对不起,我没有注意,在那个时候我正在做我的功课。根据at that time可知用过去进行时.;根据句意故选D.
考点:考查动词时态的用法。

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