John passed the exam,although he didn't study very much for itThe exam _______ difficult.A.can't have beenB.must have beenC.couldn't be D.might have been选哪一个 为什么

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John passed the exam,although he didn't study very much for itThe exam _______ difficult.A.can't have beenB.must have beenC.couldn't be D.might have been选哪一个 为什么
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

John passed the exam,although he didn't study very much for itThe exam _______ difficult.A.can't have beenB.must have beenC.couldn't be D.might have been选哪一个 为什么
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.

C，靠语感。具体分析是这是一个推测性的语句

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.

bill passed the exam .joho passed the exam 改成一句 bill passed the exam and ——— ——john 每空一每空一词 ___________.he passed the exam. 我通过考试了英语怎么说：I passed the exam,I was passed the exam,I have passed the exam? How-------(luck)!I passed the English exam ____,Kitty passed the exam.(luck) She passed the exam e____.怎么写 英语翻译he passed the exam ( ) ( ) ( ) ( ) his teacher. My bother (luck) passed the exam we all passed the exam ______(luck) ______(Fortunate),Tom passed the exam. Everyone espect Tom ______ passed the exam. _____he had passed the exam surprised everyone at lase,we all passed the exam.=in __ __,we all passed the exam John passed the exam,although he didn't study very much for itThe exam _______ difficult.A.can't have beenB.must have beenC.couldn't be D.might have been选哪一个 为什么 ___,all of them passed the exam in the end ______(luck),he passed in the math exam. __(luck)for him,he has passed the exam _______all of them passed the exam yesterday.(luck)