◎ 题干
We must _____ the room every day.
[     ]
A. clean
B. cleans
C. to clean
D. cleaning
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“We must _____ the room every day. [ ]A. clean B. cleans C. to clean D. cleaning …”主要考查了你对  【情态动词】  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。