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【单选题】

The oldest kind of computer, the abacus, has been used since ______.
A．600

B．700
C．800
D．500

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根据网考网移动考试中心的统计，该试题：

20%的考友选择了A选项

12%的考友选择了B选项

16%的考友选择了C选项

52%的考友选择了D选项

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