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

32%的考友选择了A选项

53%的考友选择了B选项

14%的考友选择了C选项

1%的考友选择了D选项

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