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。