The examination( )very difficult,as many shudents failed to pass them.A.must have been B.can be C.should have beenD.would have been

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Theexamination()verydifficult,asmanyshudentsfailedtopassthem.A.musthavebeenB.canbeC.shouldhavebeenD.

The examination( )very difficult,as many shudents failed to pass them.A.must have been B.can be C.should have beenD.would have been
The examination( )very difficult,as many shudents failed to pass them.
A.must have been B.can be C.should have beenD.would have been

The examination( )very difficult,as many shudents failed to pass them.A.must have been B.can be C.should have beenD.would have been
你好,很高兴能够在这里回答你的问题,

选A

后面说:所以很多学生没有通过,
所以前句是对 这次考试很难进行的判断

must have done 用于对过去发生事情的判断

这次考试一定很难,因为很多学生没有通过.