◎ 题干
More and more people have realized that we won’t have cleaner water to drink unless something _______soon.
A.is doneB.was doneC.will be done D.to 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“More and more people have realized that we won’t have cleaner water to drink unless something _______soon.A.is doneB.was doneC.will be done D.to be done…”主要考查了你对  【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。