◎ 题干
— Our classroom _____ every day.
— So it is. It's our duty to keep it clean and tidy.  
[     ]
A. cleans                    
B. is cleaning          
C. is cleaned
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Our classroom_____ every day.— So it is. It's our duty to keep it clean and tidy. [ ]A. cleansB. is cleaning C. is cleaned…”主要考查了你对  【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。