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          Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
          A．a(chǎn)sB．butC．soD．before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：考查連詞：句意：垃圾消息是多年以來一直讓人頭痛的事情，但是政府采取的行動還沒有達(dá)到預(yù)想的效果。兩句話是轉(zhuǎn)折關(guān)系，用but，as正如，so因此，before在….前面，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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