单项选择题

A．not try
B．try
C．not to try
D．to try
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单项选择题
A．emergencyB．urgencyC．crucialD．immediacy
A．emergency
B．urgency
C．crucial
D．immediacy
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
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