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          —Listen ! Helen is singing in the next room.
          —It __________ be Helen. She is in Tianjin now.   
          A．can’tB．mustn’tC．may notD．shouldn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          根據(jù)后文的答語She is in Tianjin now，可作出推測，不可能是Helen，故選A
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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