这里并不是使用了现在完成时,而是情态动词+动词完成时的形式
must have done 常用于表示对过去的行为或动作进行的推测猜测,评论或者判断
pick the flower这个动作已经发生,现在猜测是谁采的,是对于过去已发生事情的猜测
所以使用的是动词的完成时
由此也可引申出对于现在的猜测评论,则不用动词的完成形式
比如,You must be joking.
It must have been they who picked the flowers.这里的强调句的must have been 为什么用现在完成时?
It must have been they who picked the flowers.这里的强调句的must have been 为什么用现在完成时?
英语人气：401 ℃时间：2019-10-19 22:04:04
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