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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】選A。考查被動語態的用法。由于句中主語“Our classroom”是事物,教室只能是被打掃,因此需要用被動語態來表達,由句中“every day”確定,此處應該用一般現在時,其結構為is cleaned。故選A。

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