题目内容
【题目】Both his parents look sad. Maybe they _________what's happened to him.
A.knew
B.have known
C.must know
D.will know
【答案】B
【解析】句意:他的父母看起来很悲伤。或许他们已经知道他发生了什么事情吧。表示“已经知道”,故用现在完成时。
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题目内容
【题目】Both his parents look sad. Maybe they _________what's happened to him.
A.knew
B.have known
C.must know
D.will know
【答案】B
【解析】句意:他的父母看起来很悲伤。或许他们已经知道他发生了什么事情吧。表示“已经知道”,故用现在完成时。