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          ---What is the boy doing?
          ---He _____________ happily.
          A swims    B swam    C has swum    D is swimming
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          問(wèn)句是：What is the boy doing?說(shuō)明是用現(xiàn)在進(jìn)行時(shí)，選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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