You can't imagine that a top student          ______ have failed in the college entrance examination. 
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A
might
B
need
C
should
D
would
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(2014·湖南六校联考)I know it’s normal for such a thing to happen,but we________it if we’d been more careful.
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A
need have avoided 
B
could have avoided
C
will have avoided 
D
had avoided
You _____ pay your library fines. If not, you _____ not be allowed to graduate.
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A
may; should
B
should; need
C
must; will
D
will; can
Anirban Maitra, a professor at Oxford University, Jack’s success would not have been possible.
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A
If it weren’t for
B
Were it not for
C
Had it not been for
D
If it hasn’t been for