¿Cuándo/escuchar/uds. la radio?

When could you attach the direct object pronoun to an infinitive verb? a: when an infinitive verb follows a conjugated verb. b: when an infinitive verb ends in a question. c: when a stem-changing verb ends in a question. d: when a stem-changing verb follows a conjugated verb.

Frank is from atlanta and maria tuberto barbero is from ciudad de méxico. they became pen pals and communicate by phone because they love to talk in addition to communication through emails. based on what you learned , how would frankk dial maria’s phone numbers when he talks to her

How would i answer ¿qué haces en tu tiempo libre?