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          Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
          A．whetherB．whyC．when D．how
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：考查主語從句的連接詞。句意：準(zhǔn)確的說，土豆是什么時(shí)候被傳到歐洲的還不確定，但是可能在1565年左右。此處when引導(dǎo)主語從句并在從句中作主語。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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