Select the correct option:
Only after ten years of fieldwork __ she truly understand the dialect’s nuances.

Question

Accepted Answer

1. "Only after + time" invites inversion. That means the auxiliary comes before the subject.
2. The action is past, so we need the past auxiliary **did** plus the base verb **understand**.
3. So the sentence becomes: "Only after ten years of fieldwork did she truly understand the dialect’s nuances."

FINAL_ANSWER: b

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