The research is so designed that once begun nothing can be d

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The research is so designed that once begun nothing can be done to change it.
The research is so designed that once begun nothing can be done to change it.
为什么是once begun 为什么不是once begin.
once negun=once itis begun那算被动语态了哦,bigin不能用被动语态呀

一旦开始,没有东西可以改变它.
这里有虚拟的意思啊,因为没有开始嘛,所以begun.

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