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外语
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.
admin
2012-10-23
82
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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0
考博英语
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