英语宾语从句选择题some children want to challenge themselves by learn

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 is different from what their parents speak at home.