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
The problem has been ______ my mind all day.
A．preying on
B．getting at
C．taking on
D．seeing to
单项选择题
What is the ______ in going by boat when the plane costs no more and is quicker
A．impression
B．meaning
C．comprehension
D．sense
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