你问的是keep的过去分词吧为kept

例句

1、

We kept up a correspondence for many years.

我们保持了很多年的通信联系。

2、

Have you kept in contact with any of your friends from college?

你和你大学里的朋友还保持联系吗

3、

Your application will be kept on file.

你的申请书将存档。