单项选择题

A．In a hospital.
B．In a restaurant.
C．In a store.
D．In a bank.
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单项选择题
A．Teacher and student.B．Salesman and customer.C．Doctor and patient.D．Boss and secretary.
A．Teacher and student.
B．Salesman and customer.
C．Doctor and patient.
D．Boss and secretary.
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