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     --- Are you worried when your son often plays computer games?
     --- Yes. I think playing too many computer games ______ on teenagers.
    A．have a good effectB．has a good effect 
    C．has a bad effectD．have a bad effect
    			
    


			
    

		
    
		
		
	
    
		
    
			
    
				
    
				
    C
    根據(jù)題意我對玩電腦游戲對孩子產(chǎn)生影響是擔心的，玩太多的游戲對青少年有害，
    故不選AB，玩電腦游戲是單數(shù)第三人稱，故用has，故選C。
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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