John passed the exam,although he didn't study very much for it
Theexam_______difficult.A.can'thavebeenB.musthavebeenC.couldn'tbeD.mighthavebeen选哪一个为...
The exam _______ difficult.
A.can't have been
B.must have been
C.couldn't be
D.might have been
选哪一个 为什么 展开
A.can't have been
B.must have been
C.couldn't be
D.might have been
选哪一个 为什么 展开
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C,靠语感。具体分析是这是一个推测性的语句
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选C.John 不努力却通过考试暗含考试并不难,所以排除首先BD,如果选A的话,表示本不可能难却很难,也表示题难,与题干矛盾。且由题干可知是过去发生的事,所以用couldn't.
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