Possible Results:
había robustecido
-I had strengthened
Past perfectyoconjugation ofrobustecer.
había robustecido
-he/she/you had strengthened
Past perfectél/ella/ustedconjugation ofrobustecer.

robustecer

Las masas se han vuelto más prudentes, la disciplina se había robustecido, al parecer.
The masses had become more cautious, they had acquired a certain amount of discipline.
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to drizzle