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In the last ten years, they _______ thre...

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

A. finished  B. have finished  C. had finished  D. have been finished

 

B 【解析】 试题分析:句意:在过去的十年,他们已经完成了三项伟大的科学实验。表示自过去某一时刻到说话时这段时间的经历,用现在完成时,选B。 考点:考查时态  
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