看到中一中的英文段考題目，
有一題是這樣：
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
我自己覺得答案應該是 that,
如果是what (sth that)我覺得後面應該是tells
不知道應該怎麼理解這題？

that/which

btw, 是選擇題，另三個選項：to、who、how