Question

which university is he stuying at 还是in?

Answer 1

我觉得是atstandard expressions:at home,at work,at school,at college,at unversityat表示地点,一般用于较小的地名（方）前,译为"在.".如：at home 在家,at the station 在车站in表示地点、场所,译为"在.里"、"在....