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          It has been 4 years _____ the earthquake happened in Wenchuan
          A．whenB．sinceC．a(chǎn)fterD．while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          本題為固定搭配：It have/has been +一段時間+since +一般過去時。故選B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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