---Ourclassmust________cleanandtidyeveryday.---Everyoneinourclassshould

发布时间：2020-08-06 20:19:35

---Our class must ________ clean and tidy every day.---Everyone in our class should do something for it.A.keepB.be keptC.keepingD.to keep

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B解析解题点拨：句子的主语与谓语动词之间是动宾关系，应用被动语态．
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