单项选择题

A. Father and son.
B. Husband and wife.
C. Doctor and patient.

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单项选择题
A．He s not here.B．Yes, I do.C．Sorry, I m busy.
A．He"s not here.
B．Yes, I do.
C．Sorry, I"m busy.
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Water has three states.[A] True[B] False
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