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          —May I go swimming this afternoon?
           — I'm afraid not _______ you have finished your homework.
          A．ifB．unless C．becauseD．but
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          

          解析試題分析：句意：今天下午我可以去游泳嗎？如果你沒有完成作業(yè)恐怕不行。A. if如果 B. unless如果不C. because因為D. but但是，根據(jù)句意，故選B。
          考點：考查連詞的用法。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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