◎ 题干
—Can you come to have dinner with me this evening?  
—I'm afraid not. I _____ take care of my  grandmother. She is ill.    
[     ]
A. can't                        
B. have to    
C. may                        
D. could
◎ 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“—Can you come to have dinner with me this evening? —I'm afraid not. I_____ take care of mygrandmother. She is ill.[ ]A. can'tB. have toC. mayD. could…”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。