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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] once begun在句子中作状语.begin可以作及物动词.意思是“着手 .译文:这项研究设计得那么好.一旦着手研究.就没有什么地方要更改的了.答案为D. 【查看更多】

     

    题目列表(包括答案和解析)

    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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