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          The river has become much ______ than before because of the waste water from the factories.
          A. dirty    B. dirtier  C. Dirtiest
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          

          解析試題分析：句意：由于來自工廠的廢水，這條河變得比以前更臟了。句中暗含現(xiàn)在的河與以前的河相比較，所以應(yīng)用比較級(jí)。故選B。
          考點(diǎn)：考查介詞短語。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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