【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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