had been joining
-había estado juntando
Past perfect progressiveconjugation ofjoin.There are other translations for this conjugation.

join

About half way down the first block, one of them who had been joining in the response part of the chant ran up and took the microphone.
Como en medio de la primera cuadra, una de los que habían estado participando en la parte de la consigna en que les tocaba responder, se adelantó corriendo y tomó el micrófono.
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