In the last ten years, they three great scientific experiments. A. finished B. have finished C. had finished D. have been finished 题目和参考答案——青夏教育精英家教网—

题目内容

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

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

【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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Dear Zhang Ming，

I’m sorry to hear that

Yours,

Li Hua

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