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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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