had been rebuilding
-había estado reconstruyendo
Past perfect progressiveconjugation ofrebuild.There are other translations for this conjugation.

rebuild

According to one report, the workers had been rebuilding a tunnel that collapsed because of the flooding.
Según uno de los informes, los trabajadores estaban ocupados en el túnel en un intento de rehabilitarlo, porque ya había colapsado anteriormente por inundaciones egipcias.
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