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【单选题】

In ancient times, some catastrophic extinction of species occurred ______.
A．sequentially
B．repeatedly
C．naturally
D．intentionally

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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

2%的考友选择了B选项

87%的考友选择了C选项

4%的考友选择了D选项

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