Jane is in a hurry because the train to the airport leaves _______ half an hour. A. by B. in

Jane is in a hurry because the train to the airport leaves _______ half an hour.
A. by B. in
C. for D. until
【答案】B
【解析】
【详解】考查介词辨析。句意：Jane很着急，因为去机场的火车半小时以后就要出发了。本题的关键是the train to the airport leaves火车将要离开；在这句话里使用了一般现在时代替将来时，表示按照车站的时间表列车进出。实际上本句是一个将来时，四个选项里只有“in+一段时间”可以和将来时连用。故B正确。