In the popular block letter format, which of the following guidelines apply?
A、Start all lines at the left margin.
B、Use fully justified margins on all sides and center the body of the letter on the page.
C、Start the sender's address, the dateline, and the complimentary close at the midpoint; align all other letter parts at the left margin.
D、Double-space all content to improve readability.
In the popular block letter format, which of the following g - Unit 4 Routine and Informative Business Messages - 数字时代的商务英语写作 - U校园 | 大学网课搜题引擎