问题补充:
―Have you finished your composition already?
―Yes. I it in twenty minutes.
A. have finished
B. finished
C. will finish
D. had finished
答案:
A. have finished
(答案→)B. finished
C. will finish
D. had finished
解析:由答句中的Yes可知in twenty minutes不是表示20分钟后的将来,而是表示在20分钟之内。因为是陈述过去的某个事实,故用一般过去时。