The missing boy was last seen ___ near the river.A.playing　 B.to be playing　　C.play　　D.to play为什么选A?see的被动语态不用还原to吗?为什么不用B,

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The missing boy was last seen ___ near the river.A.playing　 B.to be playing　　C.play　　D.to play为什么选A?see的被动语态不用还原to吗?为什么不用B,
The missing boy was last seen ___ near the river.
A.playing　 B.to be playing　　C.play　　D.to play
为什么选A?see的被动语态不用还原to吗?为什么不用B,

The missing boy was last seen ___ near the river.A.playing　 B.to be playing　　C.play　　D.to play为什么选A?see的被动语态不用还原to吗?为什么不用B,
你的问题很简单
1 是由主动语态变来的：Someone saw the missing boy playing near the river.
see sb.doing:看见某人在做某事
see sb.do sth看见某人做了某事
2 因为someone看见他的时候,the boy正在玩,所以就成了saw him playing
3 再把Someone saw the missing boy playing near the river.改写成被动语态：
The missing boy was last seen playing near the river.改写成被动语态时,把原来的宾语变成主语,在把saw改写成was seen,后面的playing不变.现在,你明白了吗?

因为 “seen”被看到 是被看到正在做某事。
关于B选项，to be playing 是“正在被玩”，这显然不对

see sb do sth改成被动语态为 be seen to do sth， see sb doing sth 改成被动语态为be see doing sth 被看到正在河边玩耍

The missing boy was l___ by police in the woods. Last week the missing boy was seen_____by the lake填什么?A walk B walking C walked D have walked the missing boy was last seen ___near the housea playingb to play为什么不能选B而选A when the boy was The old man found the missing boy ——偶然 the police （ ）looking for the missing boy in the forestis b.was c.ared.were应该选c，但是为什么不选d呢 英语翻译child answering the description of the missing boy was found safe and well in London yesterday.well的意思不能省略每个词都要翻译,老师要求的. ( )alone in the room by his parents made the boy cryA.his being B.he was left C.his missing D.because his leaving the ----boy was last seen----near the East Lake  A.missing,playing.C.missed,played,我选得C,为什么, At this moment your job is______ (find)the missing boy. The _______ boy was last seen ________ near the East lake.第二个空为什么不是to play啊A missing;playing B missing; play C missed;played D missed;to play 1.The missing boy was last seen ____ near the river.A.playing B.to be playing C.play D.to pl1.The missing boy was last seen __A__ near the river.A.playing B.to be playing C.play D.to play不是“被看见”吗?为什么不选B?8.You can’t have th The boy was monster The boy was a monster the boy was in blue She c_ the passengers and fond that one was missing He found the wallet was missing这句话对吗? The whole class ( ) searching for the missing boy when the heavy rain poured down.A. was B.were C. had been D.would be没有一个人给出了正确答案 The police are still s_____ for the missing boy along the river