Who is the girl you want to make friends with?

Who is the girl you want to make friends with?
帮您查了下
此句正确语法
Whom is the girl who/that you want to make friends with?
我书本解释是这样
在前面没有介系词的关系代名词whom在口语中可以用who代替
如这句就不行
The girl with whom I work is coming.(O)
The girl with who I work is coming.(X)
但是千万记得前面有介系词千万不能使用that 如果为受格又有介系词在前面就只能使用whom
The girl with that I work is coming.(X)