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          The students _______ their homework carefully when the teacher walked into the classroom quietly.
          A．doB．did
          C．a(chǎn)re doingD．were doing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：學(xué)生們正在認(rèn)真做作業(yè)，當(dāng)老師安靜地走進(jìn)教室時(shí)。根據(jù)when the teacher walked into the classroom quietly當(dāng)老師安靜地走進(jìn)教室時(shí)，可知學(xué)生們正在做某事，從句為一般過去時(shí)，主句為過去進(jìn)行時(shí)，故選D.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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