The professor found no student in the lecture hall when he arrived.Only then did he realize that he came much too early.
问题描述：
The professor found no student in the lecture hall when he arrived.Only then did he realize that he came much too early.
求翻译,
答
教授到达讲堂时发现一个学生也没来,那时他才注意到他来的太早了.