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          — Must we wear our school uniform this afternoon?
          — No, you. All of us will go on an outing.
          A．mustn't B．can'tC．needn'tD．couldn't
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：mustn't禁止；can't不能，不可能；needn't不必；couldn't不能。句意：我們必須今天下午穿上我們的校服嗎？——不，你們不必。我們都要去郊游。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，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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