I felt so that I fell in the History class this afternoon.A. sleeping; asleepB. sleepy; as

问题补充：

I felt so that I fell in the History class this afternoon.

A. sleeping; asleep

B. sleepy; asleep

C. sleepy; sleep

D. asleep; sleepy

答案：

A. sleeping; asleep

(答案→)B. sleepy; asleep

C. sleepy; sleep

D. asleep; sleepy

解析：sleepy“昏昏欲睡（没睡着）”的意思；asleep“睡着了”的意思。根据句意“我觉得太困了，以至于在下午的历史上睡着了。”故选B。