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(jīng)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(jīng)歷，用現(xiàn)在完成時，選B。

考點：考查時態(tài)

 

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