I saw a boy ( )under the tree just now A :to stand B:standing C:stood D:was standing 选哪个?

分类: 作业答案 • 2021-12-27 15:02:27

问题描述：

答

B,固定搭配 see sb doing sth.也有see sb do sth.怎么区分？see sb do sth,强调看见某人做某事的全过程see sb doing sth 强调动作正在进行