◎ 题干
More and more people have realized we won't have cleaner water to drink unless something ______
soon.
[     ]
A. was done      
B. will be done    
C. to be done    
D. is 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 we won't have cleaner water to drink unless something ______ soon.[ ]A. was doneB. will be done C. to be done D. is done…”主要考查了你对  【被动语态】【一般现在时】  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。