What do you usually do in your free time？ I enjoy reading in

What do you usually do in your free time？ I enjoy reading in the library （ ）I lose myself
in a world of good books
A.that B.which C where Dwhen 我知道不是A就是B但是为什么是A（B），与另一个在这里有区别么？
2.Alice p（ ）that world clearly
3.It s（ ）snowed this winter .So it is a little dry now