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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单项选择题
You ______ pass the exams before you could enter the college.
A. has to
B. must
C. had to
D. need
单项选择题
Mr. Smith isn’t here yet. I think he ______ about the meeting.
A. should have forgot
B. ought to forget
C. must have forgotten
D. may not forget
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