(·湖南 34)—I don't understand why you didn't go to the lecture yesterday afternoon.—I'm

问题补充：

(·湖南，34)—I don understand why you didn go to the lecture yesterday afternoon.

—Im so sorry.But Imy homework.

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：考查动词时态。根据语境，对话中的第二个人昨天下午没去听课，而是在做作业，故使用过去进行时态，表示过去一段时间内在持续发生的动作，故选B。