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           - Must I clean the Lable now?
           - No, you ____.  You may do it later.
          A．can’tB．needn’tC．mustn’tD．shouldn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查must的否定回答.句意:我必須現(xiàn)在就打掃實(shí)驗(yàn)室嗎?_不,你不必.你可以稍后打掃.must 提問的回答，可用needn’t /don’t have to，故選B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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