问题补充:
When the teacher came in, he saw some boys behind Daniel, the computer games.
A. sit, watching
B. sitting, watching
C. sit, to watch
D. sitting, watched
答案:
A. sit, watching
(答案→)B. sitting, watching
C. sit, to watch
D. sitting, watched
解析:当老师进来的时候,他看见一些男孩子坐在丹尼尔的后面,在看电脑游戏。see sb doing sth看见某人正在做某事,watching表示伴随,故选B