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had been stammering

  • past perfect progressive
    of stammer.
    stammer
    verb (used without object)
    to speak with involuntary breaks and pauses, or with spasmodic repetitions of syllables or sounds.

Example Sentences

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I sat stunned, hand still reaching toward the pillow where the envelope had been, stammering, “I... I mean ... I wasn’t...”

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot

H. Addington Bruce reports the case of one of Dr. Brill's patients, a young man who had been stammering for several years.

From Outwitting Our Nerves A Primer of Psychotherapy by Josephine A. Jackson