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          We'll have a picnic in the park this Sunday ________ it rains or it's very cold.
          A．sinceB．ifC．unlessD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          句意：除非下雨或天很冷，我們將在本周日去公園野餐。從句子之間的邏輯關(guān)系判斷此處應(yīng)為否定條件句，相當(dāng)于if...not，故排除if，而選unless。A項(xiàng)since表因果關(guān)系。D項(xiàng)until只能引導(dǎo)時(shí)間狀語從句，故排除。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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