could have done sth 和must have done sth 的区别是什么
问题描述：
could have done sth 和must have done sth 的区别是什么
答
如：He could have been very rich,but he cared for no money at all.must have done 对过去的动作的推测.如; You must have seen him yesterday.你昨天一定看到他了.微笑——阳光的感言：would have done本来要做...