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          Sales of CDs have greatly increased since the early 1990s, when people _____ to enjoy the advantages of
          this new technology. 

          A. begin 
          B. began 
          C. have begun 
          D. had begun 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
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			請(qǐng)?jiān)谶@里輸入關(guān)鍵詞：
					
					
			
          
			
          
			
          
		
          
	
          
		
		
          
			
          
			
			
		
          



							
          
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