ing表示动作的持续
ed表示动作的完成
She was watching TV when I came in.我进来时她在看电视.
She was watching TV when I was coming in.我被卡在门口时,她在看电视.（持续做进门的动作,被卡住了,哈哈哈~笑过之后请采纳~
She was watching TV when I came in.为什么不用was coming?
She was watching TV when I came in.为什么不用was coming?
英语人气：448 ℃时间：2020-03-29 15:48:35
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