all的定语从句关系词只能用that,
类似的还有：如果先行词是all,much,anything,nothing,everything,little,none等不定代词.关系代词一般用that,不用which（但something,everything,anything后偶尔也用which）.
She has nothing that is good to say,
The book doesn’t say much that amuses children.
That’s all (that) I could do at that time.
2)x05先行词如果被形容词最高级以及first,last,any,only,few,much,no,some,very等修饰,引导限定性定语从句常用关系词that,不用which,who或者whom
He is the only person that was present at the time.
This is the best TV set that is made in China.
Please send us any information that you have about the subject.
3)x05如果有两个或两个以上的先行词,兼指人或物,应用that
He was watching the children and parcels that filled the car.
The boy and the dog that are in the picture are very lovely.