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           There is no point advocating banning smoking in public ________ the law is introduced.
          A．whenB．unless
          C．sinceD．because
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          B 考察連詞。句義：除非成為法律條文，否則在公共場所倡議禁止吸煙是沒有意義的。When當(dāng)..時(shí)；unless除非；since自從；because因?yàn)�；故B正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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