has been tying
Present perfect progressivehe/sheconjugation oftie.

tie

SIS has been tying to identify The Man for the past three years.
Hace tres años que intentamos identificarlo.
Open Doors has been tying up loose ends from the Yuletide archive import, and is working on preparing two other archives for a manual import.
Open Doors (Puertas Abiertas) ha estado atando cabos sueltos de la importación del archivo de Yuletide, y prepara otros dos archivos para su importación manual.
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