问题补充:
--Can I call you back at two o’clock this afternoon?
---- I’m sorry , but then I to Beijing . How about five ?
A. fly
B. will be flying
C. will fly
D. am flying
答案:
A. fly
(答案→)B. will be flying
C. will fly
D. am flying
解析:句意:我能在今天下午2点给你回电吗?对不起,我想那个时候我将正在飞往北京的飞机上,5点怎么样?将来进行时表示将来的某个点时间正在做的事情,故选B