Here is the item:
Because her hands were still slippery with soap, Marilyn dropped the watermelon, which __________ on the floor in an explosion of pulp and seeds.

The blank requires the past tense of burst, an irregular verb. You chose burst, one of two correct options. Nice work, grammar brain!

Verb Simple
Present
Simple
Past
Past
Participle
burst burst(s) burst or bursted burst or bursted

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