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had been debriefing

  • past perfect progressive
    of debrief.
    debrief
    verb (used with object)
    to interrogate (a soldier, astronaut, diplomat, etc.) on return from a mission in order to assess the conduct and results of the mission.

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At this point the two intelligence officers who had been debriefing Arnold asked to accompany him when he interviewed Dahl’s boss about the weird metal.

From Washington Post ● Oct. 12, 2016