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				 The class         before Tom         into the  classroom.A. began; was walking    B.  had begun; walked  C. begins;  walks  D. was beginning;  walked			【查看更多】
			


		
           
          


		
          
		
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          The class________ before Tom________ into the classroom.
            
          A. began; was walking   B. had begun; walked     C. begins; walks     D. was beginning; walked
          

			
          
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