the research is so designed that once _____ nothing can be done to change it

来源：百度知道编辑：UC知道时间：2024/07/04 19:44:41

the research is so designed that once _____ nothing can be done to change it
A begins B.having begun C.begining D. begun
分析一下
omg~the correct answer should be D.but i don't know why？

B having begun

调查是这样设计的一旦已经开始了没有什么可以改变

答案是D，使用的是非谓语动词做状语的语法，此处的非谓语动词是过去分词，once begun的意思是once if it begun，如果它一旦开始，表示假设的意思。

A
一旦（它）开始

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