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【题目】______ environmental damage is doneit takes many years for the ecosystem to recover

A.Even if B.If only

C.As if D.Once

【答案】D

【解析】一旦环境破坏被造成,它将会法非好多年让生态系统恢复。根据句意选D 一旦而 A即使 B只要 C好像,均不符合题意。

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