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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:
10%
的考友选择了A选项
28%
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2%
的考友选择了C选项
60%
的考友选择了D选项
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