（2014年北京市西城区高三5月二模试题）28. It was unusual that such close neighbors ______ not know one another.
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A
could
B
would
C
must
D
should
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It’s high time that we students________ harder as the examination is drawing nearer.
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A
work
B
will work
C
worked
D
have to work
——Are you content with her lecture?——Nowhere near that. It ____.
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A
may have been good
B
couldn’t have been worse
C
can’t be better
D
must be better
My mother ________ always wave goodbye to me while I was leaving for school.
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A
should
B
must
C
could
D
would
for the free tickets, I would not have gone to the films so often.
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A
If it is not
B
Were it not
C
Had it not been
D
Should it not be