Question

last night 9:00, he was doing his homework. 怎么读

-What was Tom doing at 9：00last night？
-He ______ his homework．（　　）

A. does

B. did

C. is doing

D. was doing

Answer 1

答案：D
根据第一句句意：-汤姆在昨晚9点正在做什么？用的是过去完成时，可以推断出第二句句意：他正在做作业．也应该用过去进行时态，过去进行时态表示在过去某一时刻或某一段时间内进行或发生的动作用过去进行时，过去进行时的构成是was/were+现在分词，故选D．