If we have to choose between these three (in/at/just), which one is more suitable to use in this sentence below:
She's ____ behind you!
It was a multiple choice by the way, it must have one answer. I've never heard of just behind you, but I've heard of right behind you. Since just can mean exactly, is this the possible answer? And I've also never seen prepositions come before behind. So, which one do you think is correct?