英语宾语从句选择题some children want to challenge themselves by learning a language different from ____ their parents speak at home.A.what B.which 为什么不选which?我想问下宾语从句中可以用which做引导词在从句中作宾语吗?请回答我这个问题!

填what.speak( )缺了宾语，

有些孩子想通过学习一门(与他们的父母在家里讲的不同的)语言来挑战自我。
a language [that] (different from ____ their parents speak at home.)
that后是language 的定语从句.
A is different from __B__
A B要是同一种东西.对等的.
a language different from ( ____ their parents speak at home.)
括号内应该也是指一种语言.
如果用which 应该是: the language that/which their parents speak at home.
本题是主语从句.what parents speak at home. =the language that/which their parents speak at home.
知识在于点滴积累，更在于不懈努力。
祝你学习进步，更上一层楼！
——另外，正在冲采纳率，请记得采用，谢谢合作！
(*^__^*)

这个引导词除了引导从句,还是from这个介词的宾语,而介词后面必须接名词、代词、动名词等做其宾语…… 如果想用which,句子改成这样比较好：some children want to challenge themselves by learning a language,which...

宾语从句的话那个language 应该用the