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          Attention，please! All the mobile phones _____________during the meeting．
            
          A．must keep off                                   B．have to keep off 
            
          C．are keeping off                                   D．must be kept off
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、D
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Attention，please! All the mobile phones _____________during the meeting．
            
          A．must keep off                                   B．have to keep off 
            
          C．a(chǎn)re keeping off                                   D．must be kept off
          

			
          
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