Take a look at the sentence again:
Giselle dreaded attending her US Government class. Whenever Dr. Duncan called
on her, Giselle felt as if she had __________ in her chair; she couldn't
open her mouth, let alone answer one of his questions.
The sentence requires the past participle of freeze, an irregular verb. Frozen is the past participle.
| Verb | Simple Present | Simple Past | Past Participle |
| freeze | freeze(s) | froze | frozen |
Froze, the form you chose, illegally combines the simple past with the auxiliary verb had. Before you continue, review the rules for irregular verbs.
Go back to the sentence to try again.