句子结构分析,这是宾语从句吗?

问题描述:

句子结构分析,这是宾语从句吗?
it doesn't matter in what order the letters in a word are,the only important thing .其中in what order 是做什么成分呢

主语从句.the letters in a word are in what order是真正主语.it是形式主语.in what order在从句里做宾语,或者说是表语(表语,之前说错了).