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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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