had been frequenting
Past perfect progressiveconjugation offrequent.There are other translations for this conjugation.

frequent

Many had been frequenting the place for years and saw it as not only a bookstore but a space to share ideas, creative energy and thought.
Muchos han estado frecuentando el lugar durante años y lo veían como algo más que una librería, como un lugar en dónde compartir ideas, energía creativa y reflexiones.
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