Here is the sentence:
Even though Frances had already ate, she
stopped at the food court and bought a slice
of pizza. She wanted an opportunity to smile at the cute young man who
ran the register.
The first choice, had ate, is incorrect. [Already is an adverb and not officially part of the verb]. As you know, this verb requires the past participle eaten because of the auxiliary verb had.
| Verb | Simple Present | Simple Past | Past Participle |
| eat | eat(s) | ate | eaten |
Go to the next sentence, champ!