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 — 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

C

解析:选A。考查被动语态的用法。由于句中主语“Our classroom”是事物,教室只能是被打扫,因此需要用被动语态来表达,由句中“every day”确定,此处应该用一般现在时,其结构为is cleaned。故选A。

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