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    The research is so designed that once nothing can be done to change it. A. begins B having begun C .beginning D .begun 解析:句中once begun作状语.相当于一个条件状语从句once it is begun.而主句的主语the research与begin是动宾关系.所以答案D是正确的. 【查看更多】

     

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    (NMET 2002)The research is so designed that once ________ nothing can be done to change it.

    [　　]

    A．begins
    B．having begun
    C．beginning
    D．begun

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    22.[2002全国] The research is so designed that once ________ nothing can be done to change it.

    A. begins

    B. having begun

    C. beginning

    D. begun

     

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    22.[2002全国] The research is so designed that once ________ nothing can be done to change it.

    A. begins

    B. having begun

    C. beginning

    D. begun

     

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