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These boxes ______ for keeping the food clean and cool.

A.useB.are usedC.have usedD.were using

B

解析试题分析:句意:这些箱子是用来保持食物清洁和保鲜的。结合语境可知本句描述的是客观性动作,故用一般现在时态。主语是动作对象,故用被动语态,选B。
考点:时态及语态
点评:英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型,首先要注意句子中的时间状语,如果没有则要通过分析上下文,结合语境来判断句子的时态。语态的判断主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态,反之如果是动宾关系,则用被动语态,尤其要注意一些特殊动词的用法。

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