单项选择题

An ambulance must have priority as it usually has to deal with some kind of ().

A. urgency
B. pressure
C. crisis
D. emergency

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单项选择题
It isn't cold enough for there () a frost tonight, so I can leave my car outside safely.

A. would be
B. being
C. was
D. to be
单项选择题
() be the first to employ nuclear weapons.

A. Never China will
B. China never will
C. At no time will China
D. At any rate will China not
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