— 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�？疾楸粍诱Z態(tài)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(tài)來表達，由句中“every day”確定，此處應(yīng)該用一般現(xiàn)在時，其結(jié)構(gòu)為is cleaned。故選A。

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