单项选择题

A．Professor and student.
B．A college boy and a college girl.
C．Two college boys.
D．Husband and wife.
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单项选择题
A．Ask for another gift.B．Exchange it for something useful.C．Sell it.D．Just keep it.
A．Ask for another gift.
B．Exchange it for something useful.
C．Sell it.
D．Just keep it.
单项选择题
A．He was with a patient.B．He was away on vacation.C．He was talking to his secretary.D．He was operating.
A．He was with a patient.
B．He was away on vacation.
C．He was talking to his secretary.
D．He was operating.
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