He didn't arrive until the meeting was nearly over,for the simple reason is thathe () asllep while watching TVhad fellen/has fellen/fell/was fallingfall asleep有哪些时态?

He didn't arrive until the meeting was nearly over,for the simple reason is thathe () asllep while watching TVhad fellen/has fellen/fell/was fallingfall asleep有哪些时态?
He didn't arrive until the meeting was nearly over,for the simple reason is that
he () asllep while watching TV
had fellen/has fellen/fell/was falling
fall asleep有哪些时态?

He didn't arrive until the meeting was nearly over,for the simple reason is thathe () asllep while watching TVhad fellen/has fellen/fell/was fallingfall asleep有哪些时态?
fell asleep
因为fall asleep指入睡,形象的说就是他是一个短暂性动词,而不是一个长时间的过程.它强调一个过去的事实.一般都不会用be falling asleep的.
所以有时候英语也要有一种常识判断,不要死记硬背啊.希望可以帮到你.

答案应该是fell asleep
fall asleep的意思是入睡，一般很少用was falling asleep
其他时态还有will fall（将来时），fall（s)（一般现在时）

fell ,有那些时态要根据情况而定。