【单选题】
The upward trend towards more mixed births ______.
A.is influencing the racial barriers in the United States of America
B.is softening the historical isolation of European ethnic immigrants
C.is undergoing subtle shifts
D.is now at work
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根据网考网移动考试中心的统计,该试题:
80%的考友选择了A选项
16%的考友选择了B选项
3%的考友选择了C选项
1%的考友选择了D选项