habían complementado
Antecopretérito para el sujeto ellos/ellas/ustedes del verbo complementar.

complementar

Popularity
500+ learners.
Las leyes modelo anteriores se habían complementado con guías concebidas únicamente para orientar a los legisladores a la hora de incorporarlas al derecho interno.
It would not come before the Commission for adoption. Earlier model laws had been accompanied by guides to enactment, which had been addressed solely at legislators.
Palabra del día
la morsa