问题描述： could have been done ,could have 1个回答 分类：英语 2014-11-29 问题解答： 我来补答 来个都是虚拟.could have done是主动,本来可以做而实际没做；could have been done是被动,本来可以被做而实际没被做的. 展开全文阅读
