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          The twin sisters have learned a lot ________ they came to China.
          A．whenB．a(chǎn)fter
          C．sinceD．a(chǎn)s soon as
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意為：這對孿生姐妹到中國以來學(xué)了很多東西。when：當……時候，after：在……之后， since：自從……以來， as soon as：一……就……。根據(jù)語境，本句指的是過去某一動作對現(xiàn)在造成的影響或結(jié)果。“since+一般過去時句子”表示從過去某段時間以來，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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