单项选择题

A．Seldom use a nickname.
B．Tell online friends the name of your school.
C．Always be careful about meeting online acquaintances.
D．Give out some of your personal information.
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单项选择题
A．Teacher and student.B．Doctor and patient.C．Manager and office worker.D．Travel agent and customer.
A．Teacher and student.
B．Doctor and patient.
C．Manager and office worker.
D．Travel agent and customer.
单项选择题
A．He had lost the tickets for the theater.B．He had lost his briefcase.C．He had left his briefcase at home.D．He had left the tickets in the office.
A．He had lost the tickets for the theater.
B．He had lost his briefcase.
C．He had left his briefcase at home.
D．He had left the tickets in the office.
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