单项选择题

A．I’m Mary.
B．Can I help you
C．Sorry, the line is busy.
D．Sorry, he’s not in.
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单项选择题
A．Doctor and husband.B．Shop assistant and customer.C．Librarian and student.D．Boss and secretary.
A．Doctor and husband.
B．Shop assistant and customer.
C．Librarian and student.
D．Boss and secretary.
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