1、Both his parents look sad .Maybe they _________what's happ

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?

紫玄文命 1年前已收到3个回答举报

xianping194800 幼苗

共回答了27个问题采纳率：92.6% 举报

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

1年前

九天玄幼苗

共回答了332个问题举报

B
可能已经知道

1年前

己已巳幼苗

共回答了41个问题举报

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.

1年前

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