As you requested in the letter I had written a Foreword for your up-coming book.
As you requested in the letter I had written a Foreword for your up-coming book.
应您信中所提之请，我已为您即将出版的书写好了一篇前言。
As you requested in the letter I had written a Foreword for your up-coming book.
应您信中所提之请，我已为您即将出版的书写好了一篇前言。