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【题目】— I don't understand why you didn't go to the lecture yesterday afternoon.
—I'm so sorry. But I _________ my homework.
A.had done
B.was doing
C.would do
D.am doing

【答案】B
【解析】句意:——我不懂你为什么没参加昨天下午的讲座。——真抱歉,那时我正在做作业。根据时间状语指 yesterday afternoon“昨天下午”“那时”发生的事,故用过去进行时态,选B。

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