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【单选题】

Only (within) the past 200 years (scientists have) found (out what) fire (is).
A. within
B. scientists have
C. out what
D. is

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根据网考网移动考试中心的统计，该试题：

26%的考友选择了A选项

63%的考友选择了B选项

5%的考友选择了C选项

6%的考友选择了D选项

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