had been retarding
-había estado retardando
Past perfect progressiveconjugation ofretard.There are other translations for this conjugation.

retard

It is an excellent time to bring to light the psychological defects of each that had been retarding the development of the relationship.
Es por tanto un momento excelente para sacar a la luz defectos del carácter psicológico de cada uno que habían sido una carga para el desarrollo de la pareja.
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