—Oh, Mom, just a few minutes.
—Hurry up, Harry, or by the time you pack your belongings, the flight !
A. has left
B. will have left
C. had left
D. will be leaving
网友回答
A. has left
(答案→)B. will have left
C. had left
D. will be leaving
解析：
试题分析: 考察将来完成时的用法。句意：---妈妈，等会儿。---快点，否则等你收拾好了行李，飞机就已经飞走了。将来收拾好行李时，飞机已经飞走了。将来的某个时间已经发生，用将来完成时。所以选B。