◎ 题干
The desk is not dirty. You _____  clean it.  
[     ]
A. mustn't              
B. shouldn't  
C. needn't              
D. can't
◎ 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“The desk is not dirty. You _____clean it.[ ]A. mustn'tB. shouldn't C. needn't D. can't…”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。