Sonja's fanatical, single-minded focus on achievement is exemplified by the fact that she lives to work. Her behavior is consistent with the description of a person who is investing her energies in:

Question

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Sonja's focus on achievement and living to work suggests that she is investing her energies in a mission, which is a purpose or goal that drives her actions.

Sonja's Fanatical, Single-Minded Focus on Achievement Is Exemplified by the Fact