英语,非谓语动词having done和done的区别用法我还没弄清啊.求教,比如 ----wit

英语,非谓语动词having done和done的区别用法我还没弄清啊.求教,比如 ____wit
英语,非谓语动词having done和done的区别用法我还没弄清啊.求教,比如
____with children's pictures,the walls of the classroom look better.
这题答案是Decorated 为什么不填Having decorated?