John passed the exam,although he didn't study very much for

John passed the exam,although he didn't study very much for it
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

星宇2007 1年前已收到3个回答举报

麦乐幼苗

共回答了19个问题采纳率：89.5% 举报

选A. 这是一个情态动词表判断的题,can＋ have VPP通常表示对过去发生事情的判断.因为上句的动词时态表明事情已经发生,因此选A.C是对现在的判断,不合题意.

1年前

yulongxue 幼苗

共回答了44个问题举报

C，靠语感。具体分析是这是一个推测性的语句

1年前

zxy419 幼苗

共回答了9个问题举报

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.

1年前

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