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          Milk will turn sour soon on hot days ______ it is stored in the refrigerator．
          A．sinceB．until
          C．becauseD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：牛奶在熱天可能會(huì)變酸，除非在冰箱里面儲(chǔ)存。這里使用連詞unless“除非，如果不”，since“自從”，because“因?yàn)椤�，until“直到”，所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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