Help the dramatic head chef write his scathing review of a disastrous new kitchen gadget. Choose the correct phrase to complete his sentence.

Not only _____ the soup, but it also launched hot carrots across the dining room!

The correct answer is did it ruin.

When a sentence begins with a negative or restrictive adverbial phrase like "Not only," we must use subject-auxiliary inversion (Auxiliary + Subject + Main Verb). Since the sentence is in the past tense, we use the auxiliary verb "did" followed by the subject "it" and the base verb "ruin."