. —Have you finished your composition?—Yes I it in twenty minutes.A. have finishedB. fini

问题补充：

. —Have you finished your composition?

—Yes, I it in twenty minutes.

A. have finished

B. finished

C. will have finished

D. had finished

答案：

A. have finished

(答案→)B. finished

C. will have finished

D. had finished

解析：考查时态，句意：你完成你的作文了吗？——是的，20分钟我就完成了。可知下文强调的的是过去发生的动作，故用过去时态，选B。