The sentence requires the simple past tense because the action happened in the past. The correct sentence is:Columbus discovered America more than four years ago.
Columbus ______ America more than four years ago.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.