)entering the hall he found everyone waiting for him.A.as B.

)entering the hall he found everyone waiting for him.A.as B.while C.at D.on
一定要说清原因啊~
选B不对的啊~潇湘Angel琴韵-- enter为短暂性动词,不可用进行时 既然不能用进行时 那怎么是entering 我理解能力不大好额~能不能说详细点？