单项选择题

A．Teacher and student.
B．Salesman and customer.
C．Doctor and patient.
D．Boss and secretary.
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单项选择题
A．He is not in.B．Here is Mr. Fisher.C．I am not late.D．Show him in, please.
A．He is not in.
B．Here is Mr. Fisher.
C．I am not late.
D．Show him in, please.
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