While _____ in the room,we were all very excited.A.waited B.waiting C.to wait D.waitwaiting 为什么?

While _____ in the room,we were all very excited.A.waited B.waiting C.to wait D.waitwaiting 为什么?
While _____ in the room,we were all very excited.A.waited B.waiting C.to wait D.wait
waiting 为什么?

While _____ in the room,we were all very excited.A.waited B.waiting C.to wait D.waitwaiting 为什么?
While引导的从句省略主语,那么主语就是从句中的 we ,
we 和wait属于主动关系,所以这里要用现在分词waiting,
现在分词表示和主语存在主动关系.
希望能够帮到你!
欢迎追问!

B 这是状语从句的省略，当从句的主语和主句的主语一致且含有be动词时，可以省去主语和be动词，因为主语we和等待是主动的关系，所以是现在分词。

C