Here is the sentence:

Latoya would have swum farther, but a cramp stang her side, so she rode a wave into shore and spent the afternoon watching handsome young men parading on the beach.

The second verb, stang, is the problem. As you know, the sentence requires the simple past. Stung is the correctly spelled form.

Verb Simple Present Simple Past Past Participle
sting sting(s) stung stung

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