用所给动词的过去完成时填空
1.He told me he ____(meet) her before.
2.She thanked me for what I ____ (do) for her son.
3.I ____ (learn) 300 english words by the end of last month.
4.He ____ (leave) his office when I arrived there.
5.She ____ (visit) the city three times before she died in 1997.
6.They knew she ____ (borrow) a lot of money for her daughter.