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
Some people think it's ______ to smoke with a cigarette holder.
A．flexible
B．sophisticated
C．versatile
D．productive
单项选择题
There Was nothing we could do ______ wait.
A．or rather
B．but rather
C．rather than
D．other than
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