—Larry I will call you at 6 o’clock tomorrow morning.—Thanks Mum. But it’s too early. I

问题补充：

—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

答案：

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。