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          Mary___________ computer science last year.
          A．studies B．studiedC．will studyD．studying
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
           時間狀語last year表明本句是過去時態(tài)，所以選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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