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【单选题】

Ice skates manufactured entirely of iron were first sold in the 1800's.
A．mainly

B．successfully
C．solely
D．routinely
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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

20%的考友选择了B选项

53%的考友选择了C选项

20%的考友选择了D选项

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