When using "either...or," the verb must agree with the subject closest to it, which in this case is "the cat" (a singular noun), so the correct verb is "was".
Choose the sentence with correct subject-verb agreement? Either the cat or the dog were responsible for the mess, Either the cat or the dog was responsible for the mess, Either the cats or the dog were responsible for the mess
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.