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          ---Must we leave the classroom now?
          ---No, you _____. You _____ leave after the bell rings.
          A．mustn't; are allowed toB．don't have to; might
          C．needn't; canD．can't; are supposed to
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：must的含義是必須一定，其否定形式mustn’t表示禁止的含義。故must的否定回答一般借助于needn’和don’t have to來(lái)構(gòu)成，句意:我們現(xiàn)在必須離開(kāi)教室嗎？——不，你們不必。你們可以在鈴響之后離開(kāi)教室。在表示可能時(shí)，might表示推測(cè)語(yǔ)氣，can表示客觀的能力，結(jié)合語(yǔ)境可知選C。
          點(diǎn)評(píng)：must的否定形式是常考內(nèi)容之一，結(jié)構(gòu)比較固定，熟記即可。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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