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				 The teacher       be in the office because the light is off.  A. can’t            B.  must            C.  could        D.  must			【查看更多】
			


		
           
          


		
          
		
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          The teacher ____ be in the office because the light is off.
            
          A. can’t                B. must              C. could            D. must
          

			
          
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