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          Europeans always hold their fork in the left hand, ________Americans switch it between their left and right hands.
          A．beforeB．because
          C．whileD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          while意為“然而”，此處表示對照對比關(guān)系。句意：歐洲人總是用左手握叉子，但是美國人總是左右手交換著使用。before意為“在……之前”引導(dǎo)時間狀語從句；because引導(dǎo)原因狀語從句，意為“因為”；since意為“既然”引導(dǎo)原因狀語從句，意為“自從”引導(dǎo)時間狀語從句。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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