In the last ten years, they _______ three great scientific experiments. A．finish_刷题宝

题干

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

A．finished

B．have finished

C．had finished

D．have been finished

上一题下一题 0.85难度单项选择更新时间:2014-02-15 09:30:52

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