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had been annotating

  • past perfect progressive
    of annotate.
    annotate
    verb (used with object)
    to supply with critical or explanatory notes; comment upon in notes.

Example Sentences

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On the table at which she was sitting was a packet of typewritten sheets which she had been annotating, and two fat note books.

From Ruth Fielding Down East Or, The Hermit of Beach Plum Point by Alice B. Emerson