【正确答案】 C

【答案解析】[解析] 题意：下一趟火车何时出发?
划线词depart意为“离开，出发，启程”。
A项pull up意为“拔起，停下来，阻止”；例：You are supposed to pull up at the traffic light. 你应该在红绿灯处停车。
B项pull down意为“摧毁，推翻，拉下来，使下跌”；例：It is easier to pull down than to build. 拆房容易建房难。
C项pull out意为“离开，出发，撤离”；例：The anchor was raised and the ship pulled out. 船起了锚，并离开了海岸。
D项pull in意为“进站，到岸”；例：The train from London will pull in at noon. 从伦敦开出的火车中午进站。故选C。