单项选择题

A．Secretary and Boss.
B．Teacher and Student
C．Customer and Librarian.
D．Customer and Salesman;
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单项选择题
A．In the doctor’s office.B．In the living room.C．In the classroom.D．In the conference room.
A．In the doctor’s office.
B．In the living room.
C．In the classroom.
D．In the conference room.
填空题
The emphasis of this advertisement is on______.
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