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I saw Tom often_____ with his father during the summer holid

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I saw Tom often_____ with his father during the summer holidays.
A.swim B.swims C.swimming D.to swim
我选的答案是B,但我的老师却说是A,这道题什么理由选A啊?不是现单三吗?
我明天就要考试了.
这是什么用法导致的?能说得清楚一点吗?佰划请认真读题.
saw 是过去式,故不选B,如果是see就可以选B了,