susurrasen
-they whispered
The word susurrasen is the imperfect subjunctive form of susurrar in the third person plural.
See the full susurrar conjugation

susurrar

Se rió en voz alta, hacienda que muchos miembros de la corte susurrasen confundidos.
He laughed out loud, causing many members of the court to whisper in confusion.
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