the missing boys were last seen ____near the river A.playing B.play C.played D.to play但是see的被动语态不是 see sb to do ..

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the missing boys were last seen ____near the river A.playing B.play C.played D.to play但是see的被动语态不是 see sb to do ..

the missing boys were last seen ____near the river A.playing B.play C.played D.to play但是see的被动语态不是 see sb to do ..
the missing boys were last seen ____near the river A.playing B.play C.played D.to play
但是see的被动语态不是 see sb to do ..

the missing boys were last seen ____near the river A.playing B.play C.played D.to play但是see的被动语态不是 see sb to do ..
首先这里肯定是被动语态were last seen,
were 是be 动词are 的过去式,此处加了 last ,表示最后被看到
其次,see sb do 或 see sb doing
前者表示动作已经完结,强调结果,后者强调动作正在发生,
句中是强调当时正在发生.
翻译:那个不见了的男孩最后一次被人看到时正在河边玩耍.

see sb do 或 see sb doing
前者表示结果,后者强调正在,过程。
这个是强调当时正在,是用后者的被动形式