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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
          

          解析試題分析：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。
          考點：考查過去進行時。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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