The missing boy was last seen ___ near the river.

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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,

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?

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