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          —What _________ to the young tree yesterday?
          —Its leaves falled.

          A. happen
          B. happens
          C. happened
          D. happening
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				C				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				相關(guān)習(xí)題
			
          	
						
          
			
          
				科目：小學(xué)英語
				來源：期末題
				題型：單選題
			
          
									
          — What _____________ to the young tree yesterday?
          — Its leaves falled.
          

          [     ]
          A. happen
          B. happens
          C. happened
          D. happening
          

			
          
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