题目内容：

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 ..

优质解答

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...