单项选择题

A．Teacher and student.
B．Doctor and patient.
C．Manager and office worker.
D．Travel agent and customer.
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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.
单项选择题
A．It will become smaller.B．It will become safer.C．It will become more economical.D．It will become faster.
A．It will become smaller.
B．It will become safer.
C．It will become more economical.
D．It will become faster.
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