Peter loos very upset.Anything wrong?He_____in the exam.It was very difficult
题目
Peter loos very upset.Anything wrong?He_____in the exam.It was very difficult
A.should have failed B.must have failed C.should fail D.must fail
答案
选B：must have done 表示对过去发生行为的推测,意思是“一定,准是”,只用于肯定句中.本题中,根据
.It was very difficult（考试很难）可知,他准是挂科了.
A选项,shoud have done 对过去应该做而没有做的行为的责备.本该...（实际上没做）如：You should have been here ten minutes ago.
你本应该10分钟之前来到这.（实际上没有）
C项 表示"义务,责任" 意思是“应该”
D项 不能表示对过去行为的推测
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