—Call me at 5: 30 tomorrow morning —Why that early? I then．A. will sleepB. was sleeping

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。