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           In summer milk will quickly go bad_____ it is put into a fridge.
          A．thoughB．unlessC．becauseD．once
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意:在夏天，牛奶很快就會變質(zhì)，除非把它放在冰箱里。though雖然，盡管，引導(dǎo)讓步狀語從句；unless 除非，如果不，引導(dǎo)條件狀語從句；because 因為，引導(dǎo)原因狀語從句；once曾經(jīng)，一旦，一次。根據(jù)句意可知選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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