? environmental damage is done,it takes many years for the ecosystemto recov-er.? A.Even if? B.If only? C.While? D.Once 题目和参考答案——青夏教育精英家教网—

题目内容

?　　 environmental damage is done,it takes many years for the ecosystem(生态系统)to recov-er.?

A.Even if?　　　　　　　　 B.If only?　　　　　　　　 C.While?　　　　　　 D.Once

答案：D

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