Help the nosy roommate find out more about the giant, ticking box in the living room.

"That's a very suspicious-looking package! ________"

The correct answer is Who did you get it from?.

In modern, conversational English, when a "Wh-" question involves a preposition, we usually place the preposition at the very end of the sentence. We also need the auxiliary verb "did" to properly form this past tense object question.