had been swirling
Past perfect progressiveconjugation ofswirl.There are other translations for this conjugation.

swirl

Many also admitted to being puzzled, and even skeptical, about the allegations of anti-Semitism that had been swirling around the film for months.
Muchos también admitieron el desconcierto e incluso el escepticismo sobre los alegatos del antisemitismo que se habían estado formulando con anterioridad alrededor de la película.
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