✔ 最佳答案
1.I met John in the library. Also, my father works in this library too! 用where!!!
My father works in this library where I met John.
2.An architectis a professional.An architect designs buildings(who)用who
An architect is a professional who designs buildings.
3.Susan needs a room.Susan can write her book in a room.(where)
Susan needs a room where she can write her book .