i think he must have been a mechanic,中的must和have been是什么词啊?

问题描述:

i think he must have been a mechanic,中的must和have been是什么词啊?
1个回答 分类:英语 2014-12-06

问题解答:

我来补答
情态动词+动词完成时,即must+have+done.表对过去的行为或动作进行推测,评论或者判断.
 
 
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