was mastering
-estuve dominando
Past progressiveconjugation ofmaster.There are other translations for this conjugation.

master

It was so easy to use that in less than a month I was mastering complex XSLT transformation, thanks to the XMLSpy debugging interface, cutting down my delivery time dramatically.
Me resultó tan fácil de usar que en menos de un mes podía realizar transformaciones XSLT complejas gracias a la interfaz de depuración de XMLSpy, lo cual me ayudó a reducir mis plazos de entrega.
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