______ environmental damage is done, it takes many years for the ecosystem to re - 高中英语试题 - 超级试练试题库

题目

题型：不详难度：来源：

______ environmental damage is done, it takes many years for the ecosystem to recover.

A．Even if

B．If only

C．While

D．Once

答案

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。

核心考点

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