The adverb "occasionally" expresses frequency, and with a singular subject ("a metro"), the verb should be in the simple present tense: reaches. The simple present is used for habitual or repeated actions.
Occasionally, a metro ______the earth. Reached, Reaches, Reaching ,Has reached
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This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the Education Testing Council by HEC preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.