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          In   Britain,sales of cigarettes have been reduced __________ 30% in the past ten years.
          A．forB．toC．fromD．by
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          to表示增加、減少、降低到什么程度,一般包括底數(shù)在內(nèi)。by表示增加或減少的凈數(shù),不包括底數(shù),�？墒÷�。句意:在英國(guó),過(guò)去十年中,煙的銷量下降了30%。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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