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          We will have no water to drink _________ we don’t protect the earth.
          A. until                    B. if                       C. unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：A. until直到，B. if如果，C. unless除非，句意：如果我們不保護(hù)地球，我們將沒有水喝。if引導(dǎo)的條件狀語從句用一般現(xiàn)在時(shí)，主句用一般將來時(shí)。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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