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had been detecting

  • past perfect progressive
    of detect.
    detect
    verb (used with object)
    to discover or catch (a person) in the performance of some act.

Example Sentences

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The center’s tech crews had been detecting frequent hackings of U.S. military computer networks, and had come up with ways to counter them—but few senior officers took notice or cared.

From Slate Mar. 7, 2016