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【单选题】

The old man________ traveling by air, for he had a serious heart disease.
A.didn't use to

B.hasn't used to
C.hadn't used to
D.wasn't used to
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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

10%的考友选择了B选项

2%的考友选择了C选项

87%的考友选择了D选项

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