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has been mystifying

  • present perfect progressive
    of mystify (3rd person singular).
    mystify
    verb (used with object)
    to perplex, puzzle, or baffle; defy the understanding of.

Example Sentences

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Though the gaucho thinks he has at last got the clue to what has been mystifying them, like all skilled tacticians he intends for a time keeping it to himself.

From Gaspar the Gaucho A Story of the Gran Chaco by F.C. Tilney