A red letter day 表示大喜之日，日历上圣徒礼拜日及节日均有红字标明，因此特别重要的日子如结婚，胜利或接受荣誉称号用a red letter day 来表达。（
举一反三
- A red letter day 表示大喜之日，日历上圣徒礼拜日及节日均有红字标明，因此特别重要的日子如结婚，胜利或接受荣誉称号用a red letter day 来表达。（ ）
- A. red triangle with the letter R
- When is World Red Cross Day？
- In Britain the ( ) are all pained red A: letter boxes B: letters box C: letters boxes D: letter box
- In actual business, which of the following is called "red clause letter of credit"？（） A: Standby letter of credit B: Advance letter of credit C: Confirmed letter of credit D: Documentary credit