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          —Must I finish my homework today,Ms Liu?
          —No,_______.
           A.you mustn’t       B.you don’t have to      C.you can’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查must的用法。Must的含義是必須，一定。其否定形式mustn’t表示禁止的意思。故其否定回答一般借助于needn’t或者don’t have to不必來(lái)表示。句意：劉老師，我今天必須完成作業(yè)嗎？——不，你不必。選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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