单项选择题

A．Twenty minutes.
B．Fifty minutes.
C．Half an hour.
D．Eighty minutes.
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单项选择题
A．Waiter and customer.B．Patient and doctor.C．Wife and husband.D．Director and pupil.
A．Waiter and customer.
B．Patient and doctor.
C．Wife and husband.
D．Director and pupil.
单项选择题
A．By taking a course.B．Very well.C．In the morning.D．In the library.
A．By taking a course.
B．Very well.
C．In the morning.
D．In the library.
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