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【单选题】

The last half of the nineteenth century ______ the steady improvement in the means of travel.

A．has witnessed

B．was witnessed
C．witnessed
D．is witnessed
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

16%的考友选择了B选项

82%的考友选择了C选项

2%的考友选择了D选项

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