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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This is an ideal site for a university ______ it is far from the downtown are
A． provided thatB. now thatC. so thatD. in that
单项选择题
We are firmly ______ to the practice of power politics.
A．objected
B．opposed
C．opposing
D．conflicting
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