— What were you doing when I phoned you last night?— I my homework and was starting to su

问题补充：

— What were you doing when I phoned you last night?

— I my homework and was starting to surf the Internet.

A. have already finished

B. was finishing

C. was going to finish

D. had just finished

答案：

A. have already finished

B. was finishing

C. was going to finish

(答案→)D. had just finished

解析：句意：——昨晚我给你打电话时，你正在干什么? ——我刚刚做完作业，就要开始上网。显然“做完作业”发生在“开始上网”之前，为“过去的过去”，用过去完成时。