— Did you see the film last night? — No I some shopping at that time.A. am doingB. was d

问题补充：

— Did you see the film last night?

— No, I some shopping at that time.

A. am doing

B. was doing

C. did

D. will do

答案：

A. am doing

(答案→)B. was doing

C. did

D. will do

解析：句意：你昨晚看电影了吗？——不，那时我正在做作业。结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态，选B。