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.
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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.
单项选择题
A．He was thinking of the money he could have.B．He could not see very well.C．Pulling in the chain was hard work.D．The bottom of the boat was covered by the golden chain.
A．He was thinking of the money he could have.
B．He could not see very well.
C．Pulling in the chain was hard work.
D．The bottom of the boat was covered by the golden chain.
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