单项选择题

All flights（）because of the storm, they decided to take the train.

A. having canceled
B. having been canceled
C. were canceled
D. have been canceled

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单项选择题
The association works to promote the （）of retired people as active and useful members of the community.

A. action
B. aspect
C. location
D. status
单项选择题
It is useful to be able to predict the extent （）which a price change will affect supply and demand.

A. from
B. with
C. to
D. for
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