单项选择题

It has always been the ______ of our firm to encourage workers to take part in social activities.

A. plan
B. campaign
C. procedure
D. policy
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Cancer is second only ______ heart disease as a cause of death.
A. of
B. to
C. with
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It is necessary that we ______ have a good command of English at college.
A. must
B. have to
C. should
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