单项选择题

"Must we do it now No, you ______."

A. won’t
B. needn’t
C. can’t
D. don’t
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单项选择题
Mary’s score on the test is the highest in her class; she ______ have studied very hard.
A. may
B. should
C. must
D. ought to
单项选择题
You are welcome. This is what I ______ do.
A. should be able to
B. had better
C. ought to
D. might
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