This is ---LUCY and Lily's---- room（对画线部分提问）
问题描述：
This is ---LUCY and Lily's---- room（对画线部分提问）
答
whose room is this
答
Whose room is this?
答
Whose room is this?
说的是LUCY and Lily's表示这个房间是属于两个人的
而Lucy's and lily's就表示各自的房间