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I know it should be "a" but it sounds so awkward? So should it be "an"?

2 Answers2

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It is recommended that, when dealing with abbreviations, you apply the "rule" based on how the abbreviation would be pronounced. In this case, "Ess Oh Pee," requiring the article "an."

JBH
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Use a before words that start with a consonant sound and an before words that start with a vowel sound. Other letters can also be pronounced either way. Just remember it is the sound that governs whether you use a or an, not the actual first letter of the word.

jjrose
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