had been looming
Past perfect progressiveconjugation ofloom.There are other translations for this conjugation.

loom

I'm just mentioning it so that you don't get impression that the incident with the French teacher had been looming for years.
Lo menciono solo para que no surja la falsa impresión de que el incidente con el profesor de francés confirmó una tendencia que se mostró a lo largo de todos los años.
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