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【单选题】
The major problems withAmerica's railroad system in the mid 19th century lay in ______.
A. poor quality rails and unreliable stopping systems
B.lack of financial support for development
C.limited railroad lines
D.lack of a transcontinental railroad
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根据网考网移动考试中心的统计,该试题:
82%
的考友选择了A选项
17%
的考友选择了B选项
0%
的考友选择了C选项
1%
的考友选择了D选项
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