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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 【查看更多】

     

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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

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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

    查看答案和解析>>

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

    [　　]

    A．finished

    B．have finished

    C．had finished

    D．have been finished

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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

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