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          Mary _________ as a volunteer teacher for 10 years.
          A．worksB．will workC．workedD．has worked
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          根據(jù)時(shí)間狀語for 10 years十年了，說明本句為現(xiàn)在完成時(shí)態(tài)，所以選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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