hayan frecuentado
-they/you have frequented
Present perfect subjunctiveellos/ellas/ustedesconjugation offrecuentar.

frecuentar

Todo ello ha hecho posible que hayan frecuentado nuestras clases unos 70 estudiantes procedentes de 27 países y de 25 disciplinas distintas.
That has made it possible for our nearly 70 students, coming from 27 different countries and 25 different academic disciplines, to participate in our courses.
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lean