单项选择题

A．or
B．and
C．to
D．but
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单项选择题
A．IfB．AlthoughC．BecauseD．Since
A．If
B．Although
C．Because
D．Since
单项选择题
A．Doctor and patient.B．Passenger and bus driver.C．Teacher and student.D．Customer and merchant.
A．Doctor and patient.
B．Passenger and bus driver.
C．Teacher and student.
D．Customer and merchant.
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