The research is so designed that once (begun) nothing can be done to change it.括号里的词为什么...
问题描述:
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?
答
research 被动begin:that once (省略了the research is) begun nothing can be done to change it.