单项选择题


A．Patient and doctor.
B．Waitress and customer.
C．Wife and husband.
D．Secretary and boss.
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单项选择题
A．Mary is not here, because she is ill.B．No, it isn’t.C．Yes, it is.D．We are ready.
A．Mary is not here, because she is ill.
B．No, it isn’t.
C．Yes, it is.
D．We are ready.
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