A B 1. 请回复 a. briefly and clearly 2. 主题行 b. a potential customer 3. 尽可能提早 c. business-related 4. 倒记时 d. prize drawing 5. 业务相关的 e. as far ahead as possible 6. 抽奖 f. subject line 7. 简洁明了 g. RSVP 8. 潜在客户 h. countdown 9. 免费午餐 i. a business invitation letter 10. 商务邀请函 j. free lunch/luncheon