—Larry, I will call you at 6 o’clock tomorrow morning.
—Thanks, Mum. But it’s too early. I then.
A. am sleeping
B. am to sleep
C. will be sleeping
D. has slept
网友回答
A. am sleeping
B. am to sleep
(答案→)C. will be sleeping
D. has slept
解析：考查时态：句意：--Larry，我明天早上六点打电话给你。--谢谢，妈妈。但是太早了，那时我正在睡觉呢。时间是then= at 6 o’clock tomorrow morning.属于将来的某个时间点，用将来进行时，选C。