看到中一中的英文段考题目，
有一题是这样：
You have to follow some special tips for cooking
_____ tell you what you need to keep your friendship and then
cook the friendship soup with great patience.
答案是 what
我自己觉得答案应该是 that,
如果是what (sth that)我觉得后面应该是tells
不知道应该怎么理解这题？

that/which

btw, 是选择题，另三个选项：to、who、how