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				___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.
    A．a(chǎn)t; inB．a(chǎn)t; onC．in; onD．on; on
    			
    


			
    

		
    
		
		
	
    
		
    
			
    
				
    
				B解析:
    固定搭配at the beginning of在…的起初。on表示關(guān)于某種問(wèn)題。				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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