【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