【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