Review the item:
Theodore bought beautiful roses for Glenda, his date. Because he did not have a vase, he rinsed out a peanut butter jar. After Theodore __________ Glenda's reaction to the arrangement, he realized that he had made a poor first impression.

The blank requires the past tense of see, an irregular verb. Saw is the simple past form.

Verb Simple
Present
Simple
Past
Past
Participle
see see(s) saw seen

Seen, the form you chose, requires that an auxiliary verb comes before it. Before you continue, review the rules for irregular verbs.

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