I often saw the boys （）in the river.AI often saw the boys （）in the river.A.sawm B.swimming C.to swim D.swim

分类: 作业答案 • 2022-01-02 13:56:34

问题描述：

I often saw the boys （）in the river.A
I often saw the boys （）in the river.A.sawm B.swimming C.to swim D.swim

答

选D
often是经常发生的,所以用see sb.do sth.
如果是瞬间发生或者正在进行,用doing