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【单选题】

The people for the experiment were chosen completely ______.
A．at length
B．in essence
C．at random
D．in bulk

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参考答案：

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根据网考网移动考试中心的统计，该试题：

17%的考友选择了A选项

5%的考友选择了B选项

76%的考友选择了C选项

2%的考友选择了D选项

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