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    7．The research is so designed that once nothing can be done to change it．［NMET2002］ A．begins B．having begun C．beginning D．begun [简析]答案为D.once begun在句中作条件状语.它是状语从句once it is begun的省略形式.句意为:这项调查研究事先计划的如此完好.以致于一旦开始.什么也无法改变它. 【查看更多】

     

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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

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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

     

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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

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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

     

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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

     

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