问题补充:
When he looked up, he suddenly found himselfby a group of teenagers,
A. to be surrounded;
B. surrounded;
C. be surrounded;
D. having been surrounded;
答案:
A. to be surrounded;
(答案→)B. surrounded;
C. be surrounded;
D. having been surrounded;
解析:考查过去分词作宾补,此题考查的结构是find sth/sb done,句意:当他抬头的时候,他突然发现他自己被一群青少年包围着。be surrounded by被什么包围,在这里surrounded做宾补。所以选B。