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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You ______ to have done silly things.
A. had ought
B. hadn’t ought
C. didn’t ought
D. ought not
单项选择题
He promised me a letter; he ought to ______ it days ago.
A. be written
B. have written
C. be writing
D. write
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