问题
选择题
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
答案：B
第一空考查的是see sb doing sth，表示看见某人正在做某事，后一空为动词的现在分词作时间状语，故选答案为B