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    精英家教网 > 高中英语 > 题目详情
    ______ environmental damage is done, it takes many years for the ecosystem to recover.
    A．Even ifB．If onlyC．WhileD．Once
    D
    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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