1、Both his parents look sad .Maybe they _________what's happened to him .（呼和浩特）A.knew B.have known C.must know D.will know 选哪一个?

分类: 作业答案 • 2022-01-02 15:45:26

问题描述：

1、Both his parents look sad .Maybe they _________what's happened to him .（呼和浩特）
A.knew B.have known C.must know D.will know 选哪一个?

答

B,表示对过去某事的肯定猜测用must have done.这里没有此选项,所以B比较准.其它全部错误.

答

B
可能已经知道

答

B
其他代进去都不通丫...
他的父母看上去都很伤心,好像已经知道他发生了什么事