单项选择题

A．Make up homework problems.
B．Do research in the library.
C．Grade homework sets.
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单项选择题
A．At a bank．B．At a hotel．C．In a post-office．
A．At a bank．
B．At a hotel．
C．In a post-office．
单项选择题
A．Three.B．Four.C．Five.
A．Three.
B．Four.
C．Five.
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