While _____ in the room,we were all very excited.A.waited B.waiti_英语解答

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

人气：343 ℃　时间：2019-08-22 09:40:42

解答

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.
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