【单选题】

When was man's life changed in many ways
A．When he did.

B．It is not known.
C．When he learned how to make use of fire.
D．With fire.

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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

28%的考友选择了B选项

70%的考友选择了C选项

1%的考友选择了D选项

When was man's life changed in many waysA．When he did.