单项选择题

A．Harvard.
B．Cambridge.
C．Yale.
D．Princeton.
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单项选择题
A．In movies.B．In real life.C．When people want to say OK.D．Anytime.
A．In movies.
B．In real life.
C．When people want to say OK.
D．Anytime.
单项选择题
A．Make up homework problems.B．Do research in the library.C．Teach an introductory economics course.D．Grade homework sets.
A．Make up homework problems.
B．Do research in the library.
C．Teach an introductory economics course.
D．Grade homework sets.
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