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

A．a(chǎn)m doing B．did
C．do D．was doing

D

解析試題分析：句意：--- 剛才你注意到有人進(jìn)教室了嗎？---對(duì)不起，我沒有注意，在那個(gè)時(shí)候我正在做我的功課。根據(jù)at that time可知用過去進(jìn)行時(shí).；根據(jù)句意故選D.
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)的用法。

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