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

问题描述:

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

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 (指动作正在进行)
根据句意:是指‘学生刚才被看见正在操场踢足球.,故正确的是A