When you go on a holiday, its always a problem to decide_________.
A. where to live B. where to live in
请教老师, A和B都是对的吗?假如都是对的,有无in有什么不同?谢谢老师。
When you go on a holiday, its always a problem to decide where to live. (where 是连接副词,副词无需介词)
When you go on a holiday, its always a problem to decidewhat placeto live . (如果是名词,可以加 in,也可以省略)