Some children want to learn a language different from___their parents speak at home.为什么不能填that,some children want to learn a language different from that (that) their parents speak at home.

问题描述:

Some children want to learn a language different from___their parents speak at home.
为什么不能填that,some children want to learn a language different from that (that) their parents speak at home.

你填的两个that中的第一个是代词,代指the language 是特指且后跟定语从句.而that作代词是不能有定语的.