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【单选题】

"A dead patent" is one that _________ .
A．no longer wins money

B．has expired
C．is plagiarized
D．is violated

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根据网考网移动考试中心的统计，该试题：

10%的考友选择了A选项

60%的考友选择了B选项

22%的考友选择了C选项

8%的考友选择了D选项

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