Definition: the day, week, year, etc. before the one that has just finished Level: B2
大前天的天气好极了。
The weather was perfect ___the ___day ___before ___last.
她上上周就完成了那个项目。
She finished that project ___the ___week ___before ___last.
我们前年去拜访过他们。
We visited them ___the ___year ___before ___last.
