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
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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
单项选择题
You ______ to have done silly things.
A. had ought
B. hadn’t ought
C. didn’t ought
D. ought not
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