the missing boys were last seen _____ the Net Bar.A.enter B.entering C.to enter D.entered哪 个对呢?B还是C?为什么,有的说的不对，怎么会be seen 只能加doing 和do?不对，应是be seen to 谁还有高见，快说说

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the missing boys were last seen _____ the Net Bar.A.enter B.entering C.to enter D.entered哪 个对呢?B还是C?为什么,有的说的不对，怎么会be seen 只能加doing 和do?不对，应是be seen to 谁还有高见，快说说

the missing boys were last seen _____ the Net Bar.A.enter B.entering C.to enter D.entered哪 个对呢?B还是C?为什么,有的说的不对，怎么会be seen 只能加doing 和do?不对，应是be seen to 谁还有高见，快说说
the missing boys were last seen _____ the Net Bar.A.enter B.entering C.to enter D.entered
哪 个对呢?B还是C?为什么,
有的说的不对，怎么会be seen 只能加doing 和do?不对，应是be seen to 谁还有高见，快说说

the missing boys were last seen _____ the Net Bar.A.enter B.entering C.to enter D.entered哪 个对呢?B还是C?为什么,有的说的不对，怎么会be seen 只能加doing 和do?不对，应是be seen to 谁还有高见，快说说
B
有see sb.doing sth.这个固定词组搭配

B , c 语法不通

B
be seen doing/do被看见做什么，没有在感官动词see后加to do 的

C
感观动词see

B. see doing 代表次动作的持续性

C 看见人家进网吧肯定是看到整个过程的，没有理由只看见他一只腿跨进吧‘‘‘所以用see sb do sth．这个结构用在被动语态时要补出to.也就是sb be seen to do sth
另外，如果是SEE SB DOING STH变被动语态，就要变成SB BE SEEN DOING STH．
要提醒一下‘‘‘大家有了误解，其实SEE SB DO STH是SEE带不定式的结构，...

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C 看见人家进网吧肯定是看到整个过程的，没有理由只看见他一只腿跨进吧‘‘‘所以用see sb do sth．这个结构用在被动语态时要补出to.也就是sb be seen to do sth
另外，如果是SEE SB DOING STH变被动语态，就要变成SB BE SEEN DOING STH．
要提醒一下‘‘‘大家有了误解，其实SEE SB DO STH是SEE带不定式的结构，只是DO STH前的TO被省略罢了

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一定是C 了,楼上解释得很到位,感官动词在被动语态中,后面一定要加上+to.所以选C就对了!

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