has been concerning
-ha estado preocupando
Present perfect progressivehe/sheconjugation ofconcern.

concern

The only criticism pretty much has been concerning the length but that we expected anyway.
El único criticismo básicamente ha sido en cuanto a la duración, pero de todas formas ya lo esperábamos.
Another key aspect proposed (as question) in the Forum has been concerning the long-term sustainability of these institutional mechanisms.
Otro aspecto clave planteado (como interrogante) en el Foro ha sido acerca de la sostenibilidad, en el largo plazo, de estos mecanismos institucionales.
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