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(guò)去的十年，他們已經(jīng)完成了三項(xiàng)偉大的科學(xué)實(shí)驗(yàn)。表示自過(guò)去某一時(shí)刻到說(shuō)話時(shí)這段時(shí)間的經(jīng)歷，用現(xiàn)在完成時(shí)，選B。

考點(diǎn)：考查時(shí)態(tài)

 

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