Did you see them ___________ in the river just now?

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问题 Did you see them ___________ in the river just now?

选项 A、to swim
B、swam
C、swimming

答案C

解析 see sb doing sth看见某人在干某事。还可以说see sb do sth,其中不定式符号to被省去了。类似的用法还有:watch sb doing sth,find sb doing sth等。
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