had been mucking
Past perfect progressiveconjugation ofmuck.There are other translations for this conjugation.

muck

First session: He was not in his class when I went to look for him and he came to my room a few minutes later saying that he had been mucking around. (I had arranged with him a change of day.)
Jorge no estaba en su clase cuando fui a buscarlo y llegó a mi habitación unos minutos después diciendo que había estado tonteando (yo había arreglado con él cambiar el día de la sesión.
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