the and of October前加at,in,of还是on

the and of October前加at,in,of还是on
the and of October前加at,in,of还是on

the and of October前加at,in,of还是on
at the end of October
在特定时间,某件事发生或即将发生,这种情况下,时间因素前用介词 at

是 in the end of October