__________ environmental damage is done, it takes many years for the ecosystem(��̬ϵͳ) to recover. A....
2023-02-02 06:22:30 131次 2013届福建省、安溪一中高一下学期期末联考英语试题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
__________ environmental damage is
done, it takes many years for the ecosystem(��̬ϵͳ) to recover.
A. Even
if B. If only C. While D.
Once
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