◎ 题干
Their classroom            every day.            
[     ]
A. was cleaned
B. is cleaned
C. is cleaning
D. clean
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Their classroomevery day.[ ]A. was cleanedB. is cleanedC. is cleaningD. clean…”主要考查了你对  【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。