单项选择题

A．At the end of this month.
B．Yes, quite often.
C．Some time last month.
D．Once a month.
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单项选择题
A．Boss and secretary.B．Doctor and patient.C．Teacher and student.D．Shop assistant and customer.
A．Boss and secretary.
B．Doctor and patient.
C．Teacher and student.
D．Shop assistant and customer.
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