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【题目】More and more people have realized we don’t have clean water to drink unless something soon.

A.was doneB.will be doneC.to be doneD.is done

【答案】D

【解析】

句意:越来越多的人意识到,如果不立刻采取行动,我们就没有干净的水喝。

本题考查时态和语态。was done是一般过去时的被动语态;will be done是一般将来时的被动语态;to be done是动词不定式;is done是一般现在时的被动语态。unless引导的条件状语从句用一般现在时,符合主将从现的原则。故选D

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