If a business letter has reference number, the date can be omitted.

The initial letter does not refer to the letter of establishing business relations.（）

An effective application letter is quite different from a formal business letter.

A business letter should always be （)

请用英文回答：How to make a business letter courteous？

The initial letter does not refer to the letter of establishing business relations.

Jane’s letter will respond to a customer inquiry. Her letter should not only answer the questions but also promote her business and its products and services.

In a business letter, “CA” is an example of a _______________.

A letter of complaint （or a complaint letter) advises the reader of an error in a business transaction or a defect discovered in a consumer product or _____