— I don’t understand why you didn’t go to the lecture yesterday afternoon.A. had doneB. wa

问题补充：

— I don’t understand why you didn’t go to the lecture yesterday afternoon.

A. had done

B. was doing

C. would do

D. am doing

答案：

A. had done

(答案→)B. was doing

C. would do

D. am doing

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。指昨天下午“那时”发生的事，故用过去进行时态。

【考点定位】考查动词的过去进行时态。