问题
选择题
— 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
答案
答案：C
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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
答案：C