estaban seleccionando
-they/you were selecting
Imperfect progressiveellos/ellas/ustedesconjugation ofseleccionar.

seleccionar

Así, en 1999 se inicia la construcción de pequeños depósitos de madera aptos para las cantidades que se estaban seleccionando.
As a result, in 1999 they started the construction of small wooden deposits suitable for the amounts that were being selected.
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