Here is the item:
Mauricio would have _________ the seven-foot wave into shore if a huge shark had not been patrolling the waters underneath the surfboard, hungry for a dangling arm or leg.

The blank requires the past participle of ride, an irregular verb. You chose ridden, the correct form. Hallelujah!

Verb Simple
Present
Simple
Past
Past
Participle
ride ride(s) rode ridden

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