[题目]I often saw the boys in the river.A. swam B. swimming C. to swim D. swim 题目和参考答案——青夏教育精英家教网—

【题目】I often saw the boys in the river.

A. swam B. swimming C. to swim D. swim

【答案】D

【解析】句意：我经常看到男孩们在河中游泳。see sb. do sth.意为“看到某人做某事”，see sb. doing sth.意为“看到某人正在做某事”。根据句中often判断，是经常看到某人做某事，而不是某一次的具体行为。结合句意，应该用see sb. do sth.结构。答案选D。

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