单项选择题

He ______ have been nervous because he didn't go straight in.

A. ought to
B. must
C. should
D. had to
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There is an increasing ______ to make movies describing violence.
A. strength
B. direction
C. tradition
D. trend
单项选择题
I beg ______ your nephew's wedding.
A. to be excused
B. to be excused from
C. to excuse from
D. to be excused to
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