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When the waste things____________, we ca...

When the waste things____________, we can save energy and at the same time reduce pollution.

A.recycle B.were recycled C.are recycled D.have cycled

 

C 【解析】 句意:当废弃的东西被循环使用时,我们就能节约能源,同时减少污染。 考查动词的时态和被动语态。recycle循环利用,动词原形;were recycled一般过去时的被动语态;are recycled一般现在时的被动语态;have cycled现在完成时。根据句意可知,主语the waste things与动词构成被动关系,应用被动语态,排除A和D;由空后we can…可知,这句话使用的是一般现在时,故选C。  
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