You buy a gift, but you can if you want to. A. must B. mustn't C. have to D. don't have to [解析]:D.考查情态动词.don’t have to 意为“没有必要 .符合语境.句意为:“你没有必要买礼物.但如果你想买的话.你也可以买. 查看更多

 

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 You__________buy a gift, but you can if you want to.

     A. must            B. mustn't          C. have to          D. don't have to

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You       buy a gift, but you can if you want to.

A. must                        B. mustn't          C. have to          D. don't have to

 

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You       buy a gift, but you can if you want to.

A. must                        B. mustn't          C. have to          D. don't have to

 

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 You       buy a gift, but you can if you want to.

A. must            B. mustn't          C. have to              D. don't have to

 

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You  ___ buy a gift,  but you can if you  want to.    
[     ]
A. must                            
B. mustn't  
C. have to                        
D. don't have to

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