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          When the teacher came into the classroom, all of us __________ the classroom.
          A. are cleaning   
          B. were cleaning   
          C. cleaned
          D are  cleaned
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          句意：當老師走進教室的時候，我們所有人都正在打掃教室。根據(jù)前面句子的時態(tài)可知后面應(yīng)用過去進行時。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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