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obedience
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单项选择题
A．Makes up homework problems.B．Does research in the library.C．Teaches an introductory economics course.D．Grades homework sets.
A．Makes up homework problems.
B．Does research in the library.
C．Teaches an introductory economics course.
D．Grades homework sets.
单项选择题
A．At the information desk.B．On the platform.C．On the train.D．Near the stairs.
A．At the information desk.
B．On the platform.
C．On the train.
D．Near the stairs.
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