The research is so designed that once (begun) nothing can be done to change it.括号里的词为什么...The research is so designed that once (begun) nothing can be done to change it.括号里的词为什么用过去分词?

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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
• The research is so designed that once (begun) nothing can be done to change it.括号里的词为什么...
• The research is so designed that once (begun) nothing can be done to change it.括号里的词为什么...The research is so designed that once (begun) nothing can be done to change it.括号里的词为什么用过去分词?
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• The research is so designed that once begun nothing can be done to change