单项选择题

A．Customer and salesperson.
B．Teacher and student.
C．Boss and secretary.
D．Guest and waitress.
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单项选择题
A．In a hospital.B．In a library.C．In a travel agency.D．In a restaurant.
A．In a hospital.
B．In a library.
C．In a travel agency.
D．In a restaurant.
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