【单选题】
The last half of the 19th century ______ the steady improvement in the means of travel.
A.witnessed
B.has witnessed
C.is witnessed
D.was witnessed
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根据网考网移动考试中心的统计,该试题:
81%的考友选择了A选项
2%的考友选择了B选项
2%的考友选择了C选项
15%的考友选择了D选项