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【单选题】

A new system of quality control was ______ to overcome the shortcomings in the firm's products.
A．invested

B．informed
C．introduced
D．instructed
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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

21%的考友选择了B选项

65%的考友选择了C选项

9%的考友选择了D选项

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