had been crystallizing
Past perfect progressive conjugation of crystallize. There are other translations for this conjugation.

crystallize

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The questions and analysis of the given task had been crystallizing throughout the whole year.
Las cuestiones y análisis acerca de la atribución de los encargos en los distintos niveles han cristalizado durante todo un año.
Also, United Nations Secretary-General Ban Ki-moon explicitly urged the CD members to seize the historic opportunity that had been crystallizing for a long time.
Además, el Secretario General de las Naciones Unidas, Sr. Ban Ki-moon, instó explícitamente a los Miembros de la Conferencia a aprovechar esta oportunidad histórica que tanto ha llevado cristalizar.
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