They were astonished ..... his failure in the examination.
Awith
Bon
Cto
Dat
Answer:
D. at
Read Explanation:
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With: This preposition usually indicates accompaniment or means, but it doesn't fit the context of expressing astonishment or surprise.
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On: "On" is not typically used with "astonished." It is more commonly used to indicate location or time.
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To: "To" might be used in different contexts (e.g., "astonished to hear"), but not directly with "astonished" when referring to a cause.
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At: "At" is the correct preposition to use with "astonished" to indicate the cause or reason for the astonishment. It expresses that the failure is the specific event or fact that caused the surprise or astonishment.