The research is so designed that once _______ nothing can be done to change it. A.beginsB.having beg

题目简介

The research is so designed that once _______ nothing can be done to change it. A.beginsB.having beg

题目详情

The research is so designed that once _______ nothing can be done to change it.
A.beginsB.having begunC.beginningD.begun
题型:单选题难度:偏易来源:不详

答案

D
“连词+分词”作状语,依然由句子主语与分词的关系来确定,主动关系用现在分词,被动关系用过去分词。the research 与 begin 是被动关系,用过去分词 begun。

更多内容推荐