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          —Must I come back before supper, mum?
          —No, you        .
          A．can’tB．mustn’tC．don’tD．needn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          考查must的否定回答.句意:媽媽,我必須在晚飯前回來(lái)嗎?_不,你不必.以must開(kāi)頭的一般疑問(wèn)句，其否定性回答要借助于needn’t或don’t have to.結(jié)合所給選項(xiàng),可知選D.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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