had been groping
Past perfect progressiveconjugation ofgrope.There are other translations for this conjugation.

grope

The discovery of surplus value suddenly threw light on the problem, in trying to solve which all previous investigations, of both bourgeois economists and socialist critics, had been groping in the dark.
El descubrimiento de la plusvalía iluminó de pronto estos problemas, mientras que todas las investigaciones anteriores, tanto las de los economistas burgueses como las de los críticos socialistas, habían vagado en las tinieblas.
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