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          ----Dad, can I go out to play basketball now ?
           ----- Sorry, you can’t ______you haven’t finished your homework.
          A．before B．untilC．a(chǎn)sD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C 

          試題分析：句意：--爸爸，我現(xiàn)在可以去打籃球嗎？--對(duì)不起，你不能因?yàn)槟氵�沒(méi)有完成家庭作業(yè)。因?yàn)槭且蚬P(guān)系，用as“因?yàn)�，由于”�?A. before在…前面，B. until直到，D. unless 除非，所以選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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