单项选择题

The（）action of the policemen saved the people in the house from being burnt.

A. supreme
B. significant
C. prompt
D. vital

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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
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
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