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          Air pollution has become__________ than ever before. We must do something to stop it.
          A．seriousB．more serious
          C．most serious D．the most serious
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：根據(jù)下文than ever before可知表示和以前的對比，故用形容詞比較級作表語，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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