The teacher told me that the students I wanted to see were seen football onthe playground just now．A playing B to be playing C play D to play为什么选A
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【答案】 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