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          —Susan stays alone in the classroom and looks sad.
          —_____________to her?

          1. A.
            What happens
          2. B.
            What has happened
          3. C.
            What is happening
          4. D.
            What was happening
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				B
          B “某人發(fā)生了某事”即sth. happen to sb.，happen一般不用于進行時；Susan不高興，說明是（已經(jīng)）發(fā)生了某事，故用完成時，且完成時表示不高興的原因。				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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