estaban indagando
-they/you were investigating
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verboindagar.

indagar

Este era un concepto nuevo para muchas personas que estaban indagando la ciencia del comunismo por primera vez.
This was a new concept to many people who were digging into the science of communism for the first time.
Palabra del día
amasar