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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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.