environmental damage is done, it takes many years for the ecosystem to recover.A. Even if

发布时间：2020-08-17 13:13:59

     environmental damage is done, it takes many years for the ecosystem to recover.
A. Even if
B. If only
C. While
D. Once

网友回答

A. Even if
B. If only
C. While
(答案→)D. Once
解析：考查状语从句。由前后两个分句的逻辑系，可知是条件与结果的关系，用表示“一旦”的once。
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