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          ---- May we leave the classroom now?
           ---- No, you _____. You _____ to leave until the bell rings.
          A．mustn’t, are allowedB．can’t, aren’t supposed
          C．don’t have to, are supposedD．needn’t, aren’t allowed
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查情景交際和情態(tài)動詞�！拔覀儸F(xiàn)在可以離開教室了嗎？”“不，你們不可以。你們不能離開，在鈴聲響起之前�！眂an’t表示允許，“不可以”；needn’t“不必”；be supposed to do sth.“應(yīng)該做某事”。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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