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          I      my homework, I guess I can't join you.
          A．don't finishB．didn't finishC．haven't finishedD．won't finish
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查現(xiàn)在完成時(shí)。句意為“我猜想我不能加入你們，因?yàn)榈浆F(xiàn)在我還沒(méi)有完成作業(yè)”，從過(guò)去時(shí)間一直持續(xù)到現(xiàn)在，用現(xiàn)在完成時(shí)態(tài)表示。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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