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				 “Tip  is the short form for “To Insure Promptness  . This is           people give waiters and waitress money. A. why         B.  how         C.  when       D. what			【查看更多】
			


		
           
          


		
          
		
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          “Tip” is the short form for “To Insure (保證) Promptness (快速) ”. This is ________ people give waiters and waitress money. 
            
          A. why                  B. how                  C. when              D. what
          

			
          
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