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          【題目】The game is not very difficult _______ you understand the rules.
          A. until B. though
          C. once D. unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】C
          【解析】
          考查條件狀語從句。A. until直到---為止；B. though盡管；C. once一旦；D. unless除非。句意：一旦你明白了規(guī)則，這個游戲就不難了。此處是once“一旦”引導的條件狀語從句，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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