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				 We         talk loudly when we see the sign “Be  quiet  on the wall.   A.  must          B.  mustn’t       C.  need            D.  needn’t			【查看更多】
			


		
           
          


		
          
		
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          We _______ talk loudly when we see the sign "Be quiet" on the wall. 
          

          [     ]
          A. must 
          B. mustn't 
          C. need 
          D. needn't 
          

			
          
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          —We ______ talk loudly when we see the sign "Be quiet" on the wall. 
          —Yes, you are right.  We should be polite in public.
          

          [     ]
          A. must 
          B. mustn't 
          C. need 
          D. needn't 
          

			
          
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          We ________ talk loudly when we see the sign“Be quiet”on the wall．
          

          

          [　　]
          

          A．must
          

          

          B．mustn’t
          

          

          C．need
          

          

          D．needn’t
          

          

          

			
          
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