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          — Could we practice playing the guitar in the hall, Sir ?                  
          —No , ___________ you have the principal’s (校長(zhǎng)) note.        
          A．ifB．unlessC．becauseD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：先生我們能在大廳練習(xí)彈鋼琴嗎？不行，除非你有校長(zhǎng)的批條。A. if如果B. unless 除非，如果不C. because因?yàn)镈. since自從……。根據(jù)句意，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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