单项选择题

A．a university campus.
B．a book store.
C．a department store.
D．a police station.
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单项选择题
A．several weeks.B．until your doctor tells you.C．12 months.D．at least 6 months.
A．several weeks.
B．until your doctor tells you.
C．12 months.
D．at least 6 months.
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