must have done用法he said that the passenger （ B ）anaccident;otherwise he would have arrived by that time. A must haveB must have hadC would have hadD should have had麻烦高手解释一下
问题描述：
must have done用法
he said that the passenger （ B ）anaccident;otherwise he would have arrived by that time.
A must have
B must have had
C would have had
D should have had
麻烦高手解释一下
答
“美洲狮一定来自哪？” must have done表示肯定的推测 must have done表示肯定的猜测和推测。句意思:美洲狮可能是产自哪里呢？ 彪马可能是产自
答
must 这个情态动词后面加动词原形有表“推测”的用法,如果是must have done就是表对“过去事情的推测”