单项选择题

A．Doctor and patient.
B．Passenger and bus driver.
C．Teacher and student.
D．Customer and merchant.
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单项选择题
A．andB．howeverC．soD．therefore
A．and
B．however
C．so
D．therefore
单项选择题
A．She paid by check.B．She decided not to make the purchase.C．She paid by credit card.D．She left without paying.
A．She paid by check.
B．She decided not to make the purchase.
C．She paid by credit card.
D．She left without paying.
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