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          If we go on using energy so wastefully, ______ are that our oil wells will be dried up ______ new
          energy sources can be found to replace oil.

          A. chances; before  
          B. difficulties; after
          C. questions; since 
          D. problems; as
          			
          

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



							
          
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