Complete the roommate's dramatic text message.

"This is a disaster! _____ my leftover pizza from the fridge? I was dreaming about it all day!"

The correct answer is Who ate.

When a Wh- word (like "Who" or "What") is the subject of the question, we do not use the auxiliary verb "do/does/did". Instead, we just use the Wh- word followed directly by the main verb in its normal tense (Who + ate).