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【单选题】

A key factor in Beijing's winning ______was a promise to improve the city' s poor air quality.
A．host

B．battle
C．bid
D．chair
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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

4%的考友选择了B选项

57%的考友选择了C选项

34%的考友选择了D选项

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