The sentence can be written as: "I was astonished at his failure" or "I was astonished by his failure".
I was astonished _____ his failure.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the Audit preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.