It doesn't matter. Both are welcome. The 2nd one is more fomal (with that)
31 de julio de 2015
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Both are perfectly acceptable. There are some instances where it sounds much more natural to drop the "that," and some where it's much more natural to keep the "that," but it is completely optional in many cases.
31 de julio de 2015
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¿No has encontrado las respuestas?
¡Escribe tus preguntas y deja que los hablantes nativos te ayuden!