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          While Mary________as a secretary，her friends were studying at university．

          1. A.
            was working
          2. B.
            worked
          3. C.
            had worked
          4. D.
            works
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				A
          分析：表示過去某一段時間里正在進行的動作要用過去進行時。while(在……期間)引出時間狀語從句，從句中必須用持續(xù)性動詞，主句動詞study和從句動詞work都是延續(xù)性動詞，可以用時態(tài)一致的原則，或者都用過去進行時，或者都用一般過去時。				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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