El primero la gana. I think is the correct answer
Answer:
I think it is necessary.
Explanation:
Without the "a" it's like you're asking a question, when you add the "personal a" you're saying it as in you did that!
Answer:
No creo que haya personas esclavizadas, aunque podría haber
Explanation:
Answer:
you - puede venir Pedro a cenar a mi casa hoy?
She - Claro que sí.