The missing boys were last seen _____ near the river.为什么填playing “ing”形式?

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The missing boys were last seen _____ near the river.为什么填playing “ing”形式?

前面的missing是状语,后面是进行时态.

这是国定短语,see sb doing sth,希望采纳,满意请点赞同给力!
另外,新年同乐!