单项选择题

The students wish the summer vacation ______ now.

A．begins
B．has begun
C．began
D．had begun
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单项选择题
The business of doctors is to prevent and ______. disease.
A．kill
B．cure
C．wound
D．injure
单项选择题
Fifteen minutes ______ I can spare to talk over this matter with you.
A．are that
B．is that
C．are all
D．is all
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