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				28．--Have you  worked out the problem, Sam?  --Not yet,  but I    ．A．didn't       B．a(chǎn)m going  to      C．haven't          D．can			【查看更多】
			


		
     
    


		
    
		
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    --Have you worked out the problem, Sam? 
      
    --Not yet, but I        ．
      
    A．didn't           B．a(chǎn)m going to            C．haven't                   D．can
    

			
    
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