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She saw some boys ____ soccer on the playground when she was

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She saw some boys ____ soccer on the playground when she was on the way to the classroom
A.played B.to play C.playing
横线上该填什么,为什么呢
还有There are many children playing.
为什么playing前没有加be动词,说出道理,出现这种情况的句子该怎么用,那种句子才用到这种情况
真心求知,
可是saw是see的过式呀
C,考察了一个短语的用法:see sb doing sth指看到某人正在做某事
see还有一个用法:see sb do sth,指看到某人做某事的全过程
There be +sb doing sth,这是一个固定用法,意为:那儿有某人正在做某事