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have been sterilizing

  • present perfect progressive
    of sterilize.
    sterilize
    verb (used with object)
    to destroy microorganisms in or on, usually by bringing to a high temperature with steam, dry heat, or boiling liquid.

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The F.D.A. should have been sterilizing “the crud” out of those things to test them, Dr. Teed said.

From New York Times Feb. 6, 2015