◎ 题干
—Let's go to the movies tonight.          
—Sorry.  I      __ . I have to help my mother wash clothes.             
[     ]
A. mustn't        
B. needn't        
C. can't
◎ 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“—Let's go to the movies tonight.—Sorry.I__ . I have to help my mother wash clothes.[ ]A. mustn't B. needn'tC. 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。