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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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