2 answers:
            
              
              
                
                
B. Supo. ¿Cuándo <em><u>supo</u></em>  Ud. que iban a presentar esta obra?
Third person of the singular (she, he, it, you, 2nd person) of the perfect simple past of indicative of knowing.
 
                                
             
                    
              
              
                
                
The correct answer is c. Supo
                                
             
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