Question

The teacher told me that the students I wanted to see were seen___ football on

the playground just now．A playing　　　　 B to be playing　　　 C play　　　　　　D to play为什么选A

Answer 1

see sb do sth = sb be seen to do sth (指动作已结束）
see sb doing sth = sb be seen doing sth （指动作正在进差枝行）

根据句意：是指‘学生刚才被看见正在操场踢足球。，明没故正确的是A

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Answer 2

因为是see sb doing something 结构演变而来，只是因为变成了被动语态