had been constructing
-había estado construyendo
Past perfect progressiveconjugation ofconstruct.There are other translations for this conjugation.

construct

The claimants had been constructing identical villas on adjoining plots of land in Kuwait at the time of Iraq's invasion and occupation of Kuwait.
Las reclamantes estaban construyendo casas idénticas en terrenos colindantes en Kuwait en el momento de la invasión y ocupación de ese país por el Iraq.
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