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           — __________ when has the country been open to international trade?
          — 1978, I suppose. 
          A．SinceB．In
          C．FromD．After
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          A。根據(jù)句中的現(xiàn)在完成時態(tài)可知，此題填since最佳。Since when的意思是“從什么時候開始”，又如：Since when have you lived here?你從什么時候起住在這里的?
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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