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【单选题】
Trial and error are the source of our knowledge.
A.is
B.were
C.has
D.have been
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根据网考网移动考试中心的统计,该试题:
60%
的考友选择了A选项
24%
的考友选择了B选项
4%
的考友选择了C选项
12%
的考友选择了D选项
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