I think you will find that most native speakers (of AmE at least) will use "in" in this exmple. As to why--who knows, it's probably just an idiomatic use as is so often the case with prepositions.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
PreciousJonesCan somebody please tell me why the correct preposition is used in this case?Are you sure this is what you wanted to ask?