单项选择题

A．If
B．Although
C．Because
D．Since
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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.
单项选择题
A．butB．exceptC．withD．besides
A．but
B．except
C．with
D．besides
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