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          Rick has learned a lot about Chinese culture _____ he came to China.
          A．before B．whenC．untilD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：Rick自從來到中國了解了許多有關(guān)中國的文化。A.before“在…之前”；B.when“當(dāng)…時(shí)候”；C.until“直到…時(shí)候才”；D.since“自從”。本句時(shí)態(tài)是現(xiàn)在完成時(shí)，since從句用于現(xiàn)在完成時(shí)中。結(jié)合語境，故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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