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The policeman saw some boys______in the street and stopped t

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The policeman saw some boys______in the street and stopped them.
A playing B to play C played D since
最好有理由
The policeman saw some boys______in the street and stopped t
A playing
see sb doing sth.
see sb do sth
都表示看见某人做某事,前者表示偶然性,后者表示经常性
比如:I often hear him sing.我经常听见他唱歌(经常性)
I heard him singing yesterday.我做天听见他唱歌了(偶然性)
同类的动词还有(watch,hear等等)