英语翻译：他在会议上碰到了一位老朋友.（用含to的动词不定式回答）
问题描述：
英语翻译：他在会议上碰到了一位老朋友.（用含to的动词不定式回答）
答
He happened to meet an old friend of his in/at the meeting.
He happened to meet one of his old friends at/in the meeting.