问题补充:
The thief took off his shoes when he slipped into the house in order to steal something .
A. unnotice
B. unnoticed
C. unnoticing
D. to unnotice
答案:
A. unnotice
(答案→)B. unnoticed
C. unnoticing
D. to unnotice
解析:考查非谓语动词:句意:小偷溜进房间的时候脱下鞋子为了在不被注意的情况下偷东西。因为the thief和unnotice是被动关系,这里是过去分词做状语,所以选B。