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          Mr. Green          his lessons when I went into his office.
          A．prepares B．prepared
          C．is preparing D．was preparing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意為：我進到辦公室的時候，格林先生正在備課。本句表示的是過去某一時刻正在進行或發(fā)生的動作，應(yīng)用過去進行時。故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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