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				       is troubling me is       I don’t understand       he said    A. What; that; what        B. What; what; what    C. That; that; what      D. Why; that; which			【查看更多】
			


		
           
          


		
          
		
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               __is troubling me is    __  I don't understand what he said.    
          

             [      ]
          A. What, that   
          B. What, what     
          C. That, that      
          D. Why, that
          

			
          
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