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          【題目】When first to the market, these products enjoy great success.
          A. introducing B. introduced C. introduce D. being introduced
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】B
          【解析】
          試題考查被動語態(tài)。完整形式為when (these products were) first introduced to the market,作時間狀語從句，為避免主語重復省略括號內(nèi)容。句意：這些產(chǎn)品初次被引進市場就取得了巨大成功。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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