

cho mình hỏi những trường hợp sau dùng in hay at ạ?
1) enrol in/at a school
2) enrol in/at a university
3) enrol in/at + name +university
4) enrol in/at a college
5) enrol in/at + name+ college
1) enrol in/at a school
2) enrol in/at a university
3) enrol in/at + name +university
4) enrol in/at a college
5) enrol in/at + name+ college