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【单选题】

this linE wAs CArrying EquAl numBEr oF EAstBounD AnD wEstBounD trAins, AnD thEy _________ rEgulArly.
A．AltErED
B．AltErnAtED
C．switChED
D．ExChAngED

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根据网考网移动考试中心的统计，该试题：

19%的考友选择了A选项

77%的考友选择了B选项

0%的考友选择了C选项

4%的考友选择了D选项

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