Once harm ______ to the environment, it takes years to have the system recovered.A．doesB．is doneC．will be done D．be done-高中英语-n多题

◎ 题干

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

◎ 答案

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“Once harm ______ to the environment, it takes years to have the system recovered.A．doesB．is doneC．will be done D．be done…”主要考查了你对【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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