He wondered if he could slip out of the lecture hall without anyone .
A. noticing
B. noticed
C. to notice
D. being noticed
网友回答
(答案→)A. noticing
B. noticed
C. to notice
D. being noticed
解析：：做对本题的关键在于学生是否能排除思维定势的干扰，如题干中去掉anyone变成He wondered if he could slip out of the lecture hall without .则应选D项，表示没有被注意到。本题因有anyone，应选A表示没有人去注意他。anyone 和noticing为逻辑上的主动关系。
【标签】独立主格结构