The missing boy was last seen ____near the river.A playing B to be playing C play D to play ,选哪个

问题描述:

The missing boy was last seen ____near the river.A playing B to be playing C play D to play ,选哪个
请问为什么不选D呢?被看到、、、,不定式变为被动语态时,不是应该还原to吗?

see sb doing 看到某人正打做什么
see sb do 看某人做某事的整个过程
这是see 的两个用法
所以答案是A