一道关于介词的填空题,..To Tom's surprise,the shop girl gave the change - - mistake...请说明为什么用那个介词。

问题描述:

一道关于介词的填空题,..
To Tom's surprise,the shop girl gave the change - - mistake.
..
请说明为什么用那个介词。

另TOM 惊讶的是.店员找错了零钱.(by)

in
让汤姆惊讶的是,收银员找错了零钱。

by
by mistake 错误地,失误地