填什么介词?

who is ( between)you and Ann？

ad. 在中间；prep. 在...之间

例如:
1. What is the difference between this and that?
这和那之间的区别是什么？

2. One town ends where the next begins and there's a road that runs between.
一个城镇连接著另一个城镇，两者之间有一条路。

3. Children must attend school between 5 and 16.
5至16岁的孩子必须上学.

between
在...之间