(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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  But for the help of my English teacher, I ________ the first prize in the English Writing Competition.
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A
would not win
B
would not have won
C
would win
D
would have won
But for the help of my English teacher, I ____  the first prize in the English Writing Competition. 
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A
would not win
B
would not have won
C
would win
D
would have won
They demanded that the library _____ open to students during the vacation.
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A
should keep
B
was kept
C
would be kept
D
be kept