单项选择题

A body of volunteers（）to aid the helpless in their struggle for survival.

A. have been organized
B. have organized
C. has been organized
D. are organized

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单项选择题
I told him how to get here but perhaps I（）him a map.

A. must have given
B. had to give
C. ought to give
D. should have given
单项选择题
It is imperative that the students（）writing their papers by the end of the month.

A. finish
B. must finish
C. will finish
D.are to finish
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