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          31. It’s two weeks since we _______ the work in Beijing Ren’ai Education Institute .
          A．finishB．have finishedC．finishedD．has finished
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          固定句型It is/has been+時間段+since從句，從句用過去式。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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