estaban afiliando
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verboafiliar.

afiliar

Hicimos un estudio con Shlomo Benartzi y Alessandro Previtero, sobre personal de ING -funcionarios que trabajaban en ING. estas personas estaban en una reunión en la que se estaban afiliando a un plan 401 .
So a study that I did with Shlomo Benartzi and Alessandro Previtero, we did a study with people at ING—employees that are all working at ING—and now these people were all in a session where they're doing enrollment for their 401 plan.
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