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          —Can we leave the classroom now?
          —No, you _________. You _________ to leave until the bell rings.
          A．don’t have to; are supposedB．mustn’t; are allowed
          C．needn’t; aren’t allowedD．can’t; aren’t supposed
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：現(xiàn)在我們能離開(kāi)教室了嗎?不,不能. 直道鈴響你才能離開(kāi). don’t have to不必; mustn’t禁止,不許可; needn’t不必, can’t不能.第二個(gè)空考察的是not…until的用法。結(jié)合句意，故選D
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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