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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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