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
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单项选择题
Professor James used student volunteers as ______ for his experiment.
A．models
B．cases
C．agents
D．subjects
单项选择题
This is an ideal site for a university ______ it is far from the downtown are
A． provided thatB. now thatC. so thatD. in that
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