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environmental damage is done, it takes many years for the ecosystem to recover．

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environmental damage is done, it takes many years for the ecosystem to recover．

_______environmental damage is done, ittakes many years for the ecosystem to recover．

A．Even if

B．If only

C．While

D．Once

 

试题答案

【答案】

D

【解析】   

 

标签：manytakesforyearsit

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