Here is the sentence:

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 blank requires the past participle of freeze, an irregular verb. You chose frozen, the correct form. You are the verb master!

Verb Simple Present Simple Past Past Participle
freeze freeze(s) froze frozen

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