estaban proliferando
-they/you were proliferating
Imperfect progressiveellos/ellas/ustedesconjugation ofproliferar.
See all conjugations of proliferar

proliferar

Las exigencias impuestas por los compradores y la aplicación voluntaria de normas y del ecoetiquetado estaban proliferando.
Buyers' requirements and voluntary eco-labelling and standards are proliferating.
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