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【单选题】
Since the introduction of the new technique, the production cost ______ greatly.
A.reduces
B.is reduced
C.is reducing
D.has been reduced
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根据网考网移动考试中心的统计,该试题:
3%
的考友选择了A选项
11%
的考友选择了B选项
16%
的考友选择了C选项
70%
的考友选择了D选项
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