【題目】______ environmental damage is done，it takes many years for the ecosystem to recover．

A．Even if B．If only

C．As if D．Once

【答案】D

【解析】一旦環(huán)境破壞被造成，它將會(huì)法非好多年讓生態(tài)系統(tǒng)恢復(fù)。根據(jù)句意選D 一旦而 A即使 B只要 C好像，均不符合題意。

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