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4.Experts think we won't have clean water to drink unless something_____soon,and much remains______ about environment protection.(  )
A.would be done; doingB.is done; to be done
C.will be done; to doD.is done; to do

分析 专家认为除非采取措施,否则我们将不会有干净的饮用水,有关环境保护还有很多要做.

解答 答案是B.本题考查被动语态;题干中第一空是unless引导的条件状语从句,从句中用一般现在时表示将来,故排除A和C;something和do之间是被动关系,需要用被动语态,排除D;remain后接动词不定式,且much和do之间也是被动关系,故remain后的不定式用被动结构,即remain to be done有待被做,故选B.

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.要关注常见非谓语动词的搭配.

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