单项选择题

A．emergency
B．urgency
C．crucial
D．immediacy
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单项选择题
A．had had toB．had toC．has had toD．has to
A．had had to
B．had to
C．has had to
D．has to
单项选择题
A．similarB．criticalC．seriousD．crucial
A．similar
B．critical
C．serious
D．crucial
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