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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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