求助一道非谓语动词的选择题The research is so designed that once _____ nothing can be done to change it .A.begins B .having begun C.beginning D.begun我认为应该选C,因为从“研究开始”这种说法来看research和begin应该

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求助一道非谓语动词的选择题The research is so designed that once _____ nothing can be done to change it .A.begins B .having begun C.beginning D.begun我认为应该选C,因为从“研究开始”这种说法来看research和begin应该
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求助一道非谓语动词的选择题The research is so designed that once _____ nothing can be done to change it .A.begins B .having begun C.beginning D.begun我认为应该选C,因为从“研究开始”这种说法来看research和begin应该
求助一道非谓语动词的选择题
The research is so designed that once _____ nothing can be done to change it .
A.begins B .having begun C.beginning D.begun
我认为应该选C,因为从“研究开始”这种说法来看research和begin应该是主动关系阿,而且在一个辞典上还有一个例句是“The work on the railway project will begin in 2008.”我觉得这里的work同本题的research一样,对于begin用主动形式

求助一道非谓语动词的选择题The research is so designed that once _____ nothing can be done to change it .A.begins B .having begun C.beginning D.begun我认为应该选C,因为从“研究开始”这种说法来看research和begin应该
应该是D
The research is so designed that once (it is) begun,nothing can be done to change it.
这里的begun是被动语态做形容词

once （it has） begun，这么理解可不可以呢？
但是一般还是begin the research吧，所以ls的被动的更好些吧

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