题目内容：

求let alone具体用法
我知道LET ALONE 是更不要说,
当后面加名次和从句分别应该用什么副词
LET ALONE OF 还是LET ALONE ABOUT还是直接不加
另外下面的句子
more and more rituals and ceremonies have disappeared with the development of society in recent years,let alone about determining people's positions.

优质解答

let alone Not to mention; much less:
更不用提；更别说：“Their ancestors had been dirt poor and never saw royalty,let alone hung around with them”(Garrison Keillor)
“他们的祖先穷得要命,从来没有见过王族成员,更不用说和他们在一起了”(加里森·谢勒)
There isn't enought room for us,let alone six dogs and a cat
I haven't decided on the menu yet,let alone bought the food.
I haven't decided where to go,let alone when to leave.