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【单选题】

I am used ______ by air and only on one occasion have I ever felt frightened.
A．to travel

B．to traveling
C．traveling
D．to have traveled
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根据网考网移动考试中心的统计，该试题：

11%的考友选择了A选项

67%的考友选择了B选项

20%的考友选择了C选项

2%的考友选择了D选项

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