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【单选题】

Not until the early years of the 19th century ______what heat is.
A．man did know

B．man knew
C．didn't man know
D．did man know

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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

13%的考友选择了B选项

14%的考友选择了C选项

66%的考友选择了D选项

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