问题补充:
—Call me at 5: 30 tomorrow morning.
—Why that early? I then.
A. will sleep
B. was sleeping
C. will be sleeping
D. have been sleeping
答案:
A. will sleep
B. was sleeping
(答案→)C. will be sleeping
D. have been sleeping
解析:考查时态。句意:在明天早晨5:30叫我。——为什么那么早:我那时正在睡觉。可知下文描述的是将来某个时刻正在进行的动作,故用将来进行时态,故选C。