had been pacing
Past perfect progressive conjugation of pace. There are other translations for this conjugation.

pace

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As soon as they crossed the massive glass doors, a young thin man who had been pacing up and down, rushed towards them.
Tan pronto como cruzaron las enormes puertas de vidrio, un hombre joven y delgado que había estado paseándose arriba y abajo, corrió hacia ellos.
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