你们为什么不早点告诉我?

1.The students were havinga class on a cold morning inwinter.The teacher stood withhis back to the fire.He wantedto give advice to the studentsbefore he began his lesson. 在一个寒冷的冬天的早上,学生们正在上课。老师正背对着火站着。在上课之前,他想给学生们一些忠告。