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【单选题】

_________, ozonE lEvEls in thE ionosphErE AppEAr to hAvE DroppED rECEntly.
A．howEvEr thE rEAson
B．it is thE rEAson
C．whAt is thE rEAson
D．whAtEvEr thE rEAson

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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

30%的考友选择了B选项

3%的考友选择了C选项

65%的考友选择了D选项

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