the eve前面用什么介词

前面用介词on，例如：

1、On the eve of the poll， campaigning was bitter.在投票前夕，竞选活动如火如荼。

2、On the eve of the Revolution， the colonies produced thirty thousand tons of crude iron a year.独立战争前夕，北美十三州每年生产3万吨生铁。

3、At Christmas the visitors began their circuit of dropping in on the eve of the feast day.圣诞节时，客人们在节日前夜开始逐家拜节。