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—Our classroom _____________ every day. ...

—Our classroom _____________ every day.

—So it is. It’s our duty to keep it clean and tidy.

A. cleaned       B. cleans           

C. is cleaning       D. is cleaned

 

D 【解析】 试题分析:句意:我们的教室每天都被打扫。确实如此。保持教室的干净整洁是我们的职责。物作主语应该用被动,被动语态的结构是:主语+be+动词的过去分词,clean的过去分词为cleaned,故选D。 考点:考查被动语态。  
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