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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

 

考查被动语态。此处harm是不可数名词,用单数。句意:一旦对环境造成伤害,它需要花费多年的时间回复生态系统。

 

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