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【单选题】

Unlike competitive running , race walkers must always keep some portion of their feet in contact with the ground.
A．run

B．runner
C．runners
D．running race
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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

9%的考友选择了B选项

84%的考友选择了C选项

6%的考友选择了D选项

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