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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】

試題分析:句意:在過去的十年,他們已經完成了三項偉大的科學實驗。表示自過去某一時刻到說話時這段時間的經歷,用現在完成時,選B

考點:考查時態

 

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