【单选题】
In manufacturing, cheaper materials are constantly being ______ for the better and more expensive kind.
A.replaced
B.transformed
C.displaced
D.substituted
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根据网考网移动考试中心的统计,该试题:
29%的考友选择了A选项
8%的考友选择了B选项
6%的考友选择了C选项
57%的考友选择了D选项