______ environmental damage is done，it takes many years for the ecosystem to recover． A． Even if B． ...
2022-10-25 15:45:14 174次 2014-2015学年北京市东城区普通校高三11月联考英语试卷（解析版） 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 to recover．
A． Even if B． If only
C． As if D． Once
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