Take another look at the sentence:
Mauricio would have _________ the seven-foot wave into shore if a huge shark had not been patrolling the waters underneath the surfboard, hoping for a dangling arm or leg.
The sentence requires the past participle of ride, an irregular verb. Ridden is the past participle form.
|Verb||Simple Present||Simple Past||Past Participle|
Rided, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.