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				-Someone is  knocking at the door. It       be Jim.-It      be him. He's gone to Shanghai.A. must, mustn't.      B. may, may  not.    C. must, may not.    D. must, can't.			【查看更多】
			


		
           
          


		
          
		
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          Someone is knocking at the door. It     my sister. It's time for her to be back.
          A．can’t beB．may not beC．must beD．mustn’t be
          

			
          
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          — Someone is
knocking at the door. Is it Ann?
          


          — It _____ be
her. She is giving a performance at the theatre now.
          


          A.
may             
B. must            C.
can’t            D.
mustn’t
          


           
          

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


          A．can’t be         B．may not be        C．must be           D．mustn’t be
          


           
          

			
          
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          ---Listen! Someone is knocking at the door. Who _____it be?
          ---It _____be Tom. He phoned to visit me this evening.
          A．may; mayB．may; shouldn’tC．must; canD．can; may
          

			
          
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          --Listen! Someone is knocking at
the door. Who _____it be?
          


          ---It_____be Tom. He phoned to
visit me this evening.
          


          A.may;may      
B.may;shouldn’t   
C.must;can      D. must;may
          


           
          

			
          
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