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          You ______ be polite to the old man.
          A．shouldB．can’tC．mightD．mustn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查情態(tài)動(dòng)詞。句意“對(duì)老人應(yīng)該有禮貌�！眘hould“應(yīng)該”；can’t“不能”；might“可能”；mustn’t“禁止，不許”。故選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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