in the beginning at the beginning

in the beginning at the beginning in the beginning和at the beginning由什么区别 at the beginning 和in the beginning 有什么区别 at the beginning与in the beginning的区别 in the beginning和at the beginning的区别 in the beginning 和at the beginning如何区别? 是"at" the very beginning 还是"in" the very beginning? at the beginning of还是 in the beginning of run beginning at the in the beginning= at first? in the very beginning at the beginning和in the beginning根本区别,at.后面一定加of吗