Once harm ______ to the environment, it takes years to have the system recovered.

A. does      B. is done  C. will be done    D. be done

 

B

 

考查被動(dòng)語(yǔ)態(tài)。此處harm是不可數(shù)名詞,用單數(shù)。句意:一旦對(duì)環(huán)境造成傷害,它需要花費(fèi)多年的時(shí)間回復(fù)生態(tài)系統(tǒng)。

 

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