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．She paid by check.B．She decided not to make the purchase.C．She paid by credit card.D．She left without payin
A．She paid by check.
B．She decided not to make the purchase.
C．She paid by credit card.
D．She left without payin
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