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				23．--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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