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          The rivers will become dirtier and dirtier ______ we take action to protect them.
          A．sinceB．ifC．untilD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          since由于，自從……以來；if 是否，如果； until直到；unless除非，如果不。句意：如果我們不采取措施保護(hù)他們，這些河流會越來越臟。結(jié)合語境可知選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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