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had been excreting

  • past perfect progressive
    of excrete.
    excrete
    verb (used with object)
    to separate and eliminate from an organic body; separate and expel from the blood or tissues, as waste or harmful matter.

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Dobriner found, on examining the stored extract from her urine, that she had been excreting the uncommon steroid for at least three years before her cancer developed.

From Time Magazine Archive