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				Someone is  knocking at the door. It     my mother. It's time for her to be back.  A. can be       B. may not be    C. must  be    D.  mustn't be			【查看更多】
			


		
           
          


		
          
		
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          Someone is knocking at the door. It            my mother. It's time for her to be back. 
          

          [     ]
          A. can be 
          B. may not be
           C. must be 
          D. mustn't be 
          

			
          
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          Someone is knocking at the door. It ____ my mother. It's time for her to be back. 
          

          [     ]
          A. can be
           B. may not be 
          C. must be 
          D. mustn't be 
          

			
          
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