问题
选择题
When he looked up, he suddenly found himself by a group of teenagers,
A．to be surrounded;
B．surrounded;
C．be surrounded;
D．having been surrounded;
答案
答案：B
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。