单项选择题

Most trains ______ long distances have a dining car and a club car where refreshments are served.

A．to go
B．to be going
C．that goes
D．going
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单项选择题
The people at the party were worried about Susan because no one was aware ______ she had gone.
A．where that
B．of where
C．the place where
D．the place
单项选择题
Professor James used student volunteers as ______ for his experiment.
A．models
B．cases
C．agents
D．subjects
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