In the last ten years they three great scientific experiments. A. finishedB. have finish

问题补充：

In the last ten years, they three great scientific experiments.

A. finished

B. have finished

C. had finished

D. have been finished

答案：

A. finished

(答案→)B. have finished

C. had finished

D. have been finished

解析：in the last / past... 在过去的......时间里常用于现在完成时。