单项选择题

The people for the experiment were chosen completely ______.

A．at length
B．in essence
C．at random
D．in bulk
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单项选择题
Our interests seem to ______ at this point.
A．constrain
B．condense
C．conduct
D．converge
单项选择题
I've never ______ the theory that people are more important than animals.
A．subscribed to
B．hung on
C．engaged in
D．indulged in
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