The little boy spends most of his time-----the library.A.on B.for c.to D.in

问题描述:

The little boy spends most of his time-----the library.A.on B.for c.to D.in
这个选哪个啊,说明理由

in in the library 在图书管理 这个小男孩大部分时间都在图书馆里度过