英语begin的问题the research is so designed that once___nothing ca

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英语begin的问题
the research is so designed that once___nothing can be done to chance it.
A.begins
B.having begun
C.beginning
D.begun
这个题选D,但是为什么要用被动?这里begin是及物动词从那里看出,能不能改写一下让我看看begin是怎么样做及物动词的?

the research is so designed that once we begin it ,nothing can be done to change it.

英语begin的问题the research is so designed that once___nothing ca The research is so designed that once ___（begin ）nothing can The research is so designed that once--begun----nothing can The research is so designed that once _______nothing can be The research is so designed that once________nothing can be .The researcher is so designed that once ________ nothing ca The research is so designed that once ____ nothingcan be don The research is so designed that once ________ nothing can b The research is so designed that once begun nothing can be d The research is so designed that once (begun) nothing can be 问几个高中英语单选 1.The research is so designed that once _____nothi Eg:The research is so designed that once_____ nothing can be