《英语口语 一语千说》第八篇 商业信函 01概述，02引言部分

2. 多种表达

We have received your letter of October 1.

We have received your letter dated October 1.

We are grateful for your inquiry of August 22.

We are thankful for your inquiry of August 22.

We are pleased to learn from your letter of October 8...

From your letter of October 8 we have learned that...

This is to acknowledge your letter of October 1.

We are pleased to acknowledge receipt of your letter of October 1.

We acknowledge with thanks your letter of October 1.

We are very glad to receive your letter.

We are delighted to receive your letter.