(when he was watching) the notice, an idea came to his mind.括号里为何_英语解答

(when he was watching) the notice, an idea came to his mind.括号里为何不能用Watching?
不是非谓吗?

人气：317 ℃　时间：2020-06-16 21:02:51

解答

主语是人得时候,用Watching ,而这里的主语是an idea,所以不能这样用