hubieron entrado
-they/you had entered
Preterite perfect ellos/ellas/ustedes conjugation of entrar.

entrar

Durante siete días después que Noé y su familia hubieron entrado en el arca, no aparecieron señales de la inminente tempestad.
For seven days after Noah and his family entered the ark, there appeared no sign of the coming storm.
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Hanukkah