【单选题】
A new system of quality control was brought in to overcome the defects in the firm's products.
A.invested
B.introduced
C.installed
D.insisted
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根据网考网移动考试中心的统计,该试题:
6%的考友选择了A选项
67%的考友选择了B选项
15%的考友选择了C选项
12%的考友选择了D选项