单项选择题


Questions 9 to 12 are based on the conversation you have just heard.

A．Teacher and student.
B．Patient and doctor.
C．Classmates.
D．Colleagues.
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单项选择题
A．By taxi.B．By bus.C．On foot.D．By train.
A．By taxi.
B．By bus.
C．On foot.
D．By train.
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