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
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You are welcome. This is what I ______ do.
A. should be able to
B. had better
C. ought to
D. might
单项选择题
You ______ pass the exams before you could enter the college.
A. has to
B. must
C. had to
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