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has been propagating

  • present perfect progressive
    of propagate (3rd person singular).
    propagate
    verb (used with object)
    to cause (an organism) to multiply by any process of natural reproduction from the parent stock.

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The Haiti-born Peck included the scenes in a "critical way because it's about this image that Hollywood has been propagating, and it's not really the reality."

From Reuters Feb. 17, 2017