【题目】______ environmental damage is done，it takes many years for the ecosystem to recover．
A．Even if B．If only
C．As if D．Once
在线课程【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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