一句英文的语法理解Anna waited until they were walking out of the park befo_英语解答

一句英文的语法理解
Anna waited until they were walking out of the park before she spoke.
为什么用 were walking

人气：398 ℃　时间：2020-05-21 00:14:29

解答

这句话我的理解是
安娜等到他们即将走出公园时她才说话.
“were walking”表示一种将要发生的事,即将要走出公园这件事.
以上仅供参考