______ environmental damage is done, it takes many years for the ecosystem to recover.
A．Even ifB．If onlyC．WhileD．Once
D
考查狀語(yǔ)從句。由前后兩個(gè)分句的邏輯系，可知是條件與結(jié)果的關(guān)系，用表示“一旦”的once。
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