句式结构为：主+系+表+双定语嵌套+状语
考察one of和the one of后接定语从句的区别,其本题为例：
English is one of the official languages used in india【used修饰languages】
English is the one of the official languages used in india【used 修饰the one】
接着先理解一下这个补充
English is one language of the official languages used in india
然后再看
English【主语】 is【系动词】one【表语】of the official languages【介词短语作后置定语】used 【过去分词作后置定语,=which are（注意是are,修饰language） used】in india【地点状语】.