[题目] environmental damage is done, it takes many years for the ecosystem to recover.A. Even if B. If onlyC. While D. Once 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】 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】D

【解析】句意：一旦环境遭到破坏，生态系统需多年才能恢复。

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