【正确答案】 C

【答案解析】此题测试考生对英文to remind somebody of something的用法的掌握。在选项中的to warn somebody of something，to inform somebody of something和to remind somebody of something本身都是正确的。但细读全句，尤其是again一词后可知，是“再一次”的问题。因此，“再一次提醒”符合逻辑。To warn somebody of something意为“警告某人”，如：The general warned his soldiers of the coming danger．inform意为“通知(某人)”，如：Inform me of any further development．relieve意为“解脱(痛苦)”，如：The doctor is trying to relieve his leg of pain．