你在离开中国之前给我送了那本书，谨写此信以表达我衷心的感谢。

I'm writing to show my sincere appreciation for the book you gave it me before you left China.

youdao

您好，我是XX公司的总经理XXXXX，我谨作为A先生在我公司七个多月间的直接领导写此推荐信。

Hello, I am XX general manager XXXXX, I would like to as Mr. A in our company for more than seven months between the direct leadership to write this recommendation letter.

youdao