had been scanning
-había estado escaneando
Past perfect progressiveconjugation ofscan.There are other translations for this conjugation.

scan

One small alien in his squad had been scanning the entire area, set to detect even the smallest force, but so far had found nothing.
Un pequeño extraterrestre en su escuadrón fue a escanear toda el área, enfocado a detectar incluso la fuerza más pequeña, pero hasta ahora no había encontrado nada.
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