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          The earth will become worse and worse ________ we do something to stop her from being polluted.
          A．ifB．even ifC．whenD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
           D              
                       
          試題分析：考查連詞辨析。 If 如果；ever if 即使；when 當。。時候；unless除非。句意：除非我們做一些事情來阻止它被污染否則地球會變得越來越糟糕。Unless 相當于 if not ,根據(jù)題意可知，這是個條件句，所以選D項。          
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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