don't give your child more money...is necessary .为什么用than?which我什么不可以?

don't give your child more money...is necessary .为什么用than?which我什么不可以?
don't give your child more money...is necessary .为什么用than?which我什么不可以?

don't give your child more money...is necessary .为什么用than?which我什么不可以?
don't give your child more money than (the money) (which) is necessary
括号里的是可以省略的部分,which作为从句的提示语是可以省略的.而原题如果选了which,意思将难以理解.