2. 外语
  3. In ancient times, some catastrophic extinction of species occurred ______, but such catastrophes were comparatively rare.

In ancient times, some catastrophic extinction of species occurred ______, but such catastrophes were comparatively rare.

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问题 In ancient times, some catastrophic extinction of species occurred ______, but such catastrophes were comparatively rare.
选项 A、sequentially
B、repeatedly
C、naturally
D、intentionally
答案C
解析
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