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          —I called you at 4:00 yesterday afternoon, but no one answered.
          —Sorry, I ______ with my friends at that time.
          A．swimB．swamC．will swimD．was swimming
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
           考查時態(tài)。根據(jù)時間狀語yesterday afternoon,可知要用過去時態(tài)；再據(jù)at that time，可知要用過去進(jìn)行時態(tài)。所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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