—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
网友回答
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。