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?

题目
She was watching TV when I came in.为什么不用was coming?
答案
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~
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想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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