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【单选题】

A considerable amount of time and money has been invested in ______ this system.
A．defining

B．implying
C．reducing
D．perfecting
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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

8%的考友选择了B选项

20%的考友选择了C选项

66%的考友选择了D选项

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