had been degrading
-había estado degradando
Past perfect progressiveconjugation ofdegrade.There are other translations for this conjugation.

degrade

It was based on a thorough survey and presented a very critical assessment of how teaching had been degrading since the turn of the century.
Estaba basado en una minuciosa encuesta y presentaba un evaluación muy crítica de cómo la enseñanza se estaba degradando desde comienzo del siglo.
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