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          When the teacher came into the classroom, the students ____ in groups.
          A．workB．have workedC．were workingD．a(chǎn)re working
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          

          解析試題分析：句意：當(dāng)老師走進(jìn)教室的時(shí)候，學(xué)生正在分組學(xué)習(xí)。老師進(jìn)來這個(gè)動(dòng)作發(fā)生在過去，所以學(xué)生正在做某事，是過去的動(dòng)作，所以用過去進(jìn)行時(shí)態(tài)，故選C
          考點(diǎn)：時(shí)態(tài)
          點(diǎn)評：動(dòng)詞的時(shí)態(tài)是學(xué)習(xí)英語過程中非常重要的知識。而很多的題目，句中并沒有像本題一樣有明確的時(shí)間，很多要通過上下文的判斷得知。過去進(jìn)行時(shí)既可以表示動(dòng)作在過去的某個(gè)時(shí)間正在進(jìn)行，也可以表示動(dòng)作在過去的某一段時(shí)間一直在進(jìn)行，本題不難，平時(shí)加強(qiáng)記憶，理解即可。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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