I had no idea what you are talking about.这句话what前面为什么不加介词,比如about

I have no idea what——when l was awayA.had happenedB.had happenedC.happenedD.will happen I have no idea what to You have no idea what I feel I have no idea what do you I had no idea what you are talking about.这句话what前面为什么不加介词,比如about 英语语法问题：下述句子（见补充说明）是什么从句?I had no idea what I was talking about. I had no even a vague idea —was going to happen A of what B of whichI had no even a vague idea —was going to happen A of what B of which为什么B不对? What should i do?i have no idea. What should i do?i have no idea. Anyway,I've got no idea what I'm saying. i have no idea what i'm saying 还是i have no idea what am i saying 为什么 I had no even a vague idea —was going to happen A of what B in which C in what D of which选择什么?为什么? i have no idea what to do next译成中文 I have no idea what you just said I have no idea what you mean 的意思是什么 i have no idea what to do tomorrow同意句 actually,i have no idea what's this for. I have no idea that you were here.和I had no idea that you are here有甚么区别?