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				20． ?Another cup of coffee?   -No, thanks． I       be off． Mary is waiting for me．A． can         B． may         C． must         D． might			【查看更多】
			


		
           
          


		
          
		
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          –Another cup of coffee?
            
          –No, thanks．I _____ be off．Mary is waiting for me．
            
          A． can          B． may           C． must               D． might
          

			
          
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          －Another cup of coffee?
          

          －No, thanks．I ________ be off．Mary is waiting for me．
          

          

          [　　]
          

          A．can
          

          

          B．may
          

          

          C．must
          

          

          D．might
          

          

          

			
          
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