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          ---- How long do you think it is______ he arrived here?
          ---- No more than half a year, I believe.
          A．whenB．thatC．beforeD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D 
          考查固定短語。句意：自他到這兒以來，你認為多久啊？故用since。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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