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【单选题】

This work costs us nothing; it's all done by ______.
A．profiteers
B．mountaineers
C．engineers
D．volunteers

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根据网考网移动考试中心的统计，该试题：

33%的考友选择了A选项

9%的考友选择了B选项

4%的考友选择了C选项

54%的考友选择了D选项

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