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          The earth will become worse and worse ______ we do something to stop her from being polluted. 

          A. if 
          B. even if 
          C. when
          D. unless 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				D				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
			請(qǐng)?jiān)谶@里輸入關(guān)鍵詞：
					
					
			
          
			
          
			
          
		
          
	
          
		
		
          
			
          
			
			
		
          



							
          
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          [     ]
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