________ 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
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________ stop advertising, prices would be greatly reduced.
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A
Were they to
B
Could they
C
If they
D
Would they
You must be a student, ________you? 
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A
wasn’t
B
are
C
mustn’t
D
aren’t
Oh,I'm not feeling well in the stomach.I ________ so much fried chicken just now.
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A
shouldn't eat
B
mustn't have eaten
C
shouldn't have eaten
D
mustn't eaten