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

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

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

试题答案

B

标签：itenvironmentyearstakesharm

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