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    The research is so designed that once nothing can be done to change it． begun 【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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