I often saw the boys     in the river.
A．swamB．swimmingC．to swimD．swim
D

試題分析：句意：我經(jīng)�？吹竭@些男孩子在河里游泳。see sb. do sth.看到某人做某事，看到了全過程；see sb. doing sth.看到某人正在做某事，看到正在進行的動作，故選D。
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