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【单选题】

The designer has applied for a ______ for his new invention.
A.tariff
B.discount
C.version
D.patent

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根据网考网移动考试中心的统计,该试题:

0%的考友选择了A选项

17%的考友选择了B选项

1%的考友选择了C选项

82%的考友选择了D选项

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