◎ 题干
You  ___ buy a gift,  but you can if you  want to.    
[     ]
A. must                            
B. mustn't  
C. have to                        
D. don't have to
◎ 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“You___ buy a gift,but you can if youwant to.[ ]A. must B. mustn't C. have toD. don't have to…”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。