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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：格林老師在我走進(jìn)他辦公室時(shí)他正在備課。when從句中用的是一般過去時(shí)態(tài)，所以根據(jù)句意主句應(yīng)用過去進(jìn)行時(shí)態(tài)，故選D。
          考點(diǎn)：考查動(dòng)詞時(shí)態(tài)
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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