【单选题】
In ancient times, some catastrophic extinction of species occurred ______, but such catastrophes were comparatively rare.
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:
18%的考友选择了A选项
12%的考友选择了B选项
50%的考友选择了C选项
20%的考友选择了D选项