Question

 — 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

Answer 1

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。