问题
选择题
After________ by the police for several days, the robber had to give in.
A．surrounding
B．surrounded
C．surround
D．being surrounded
答案
答案：D
考察非谓语动词，after 是介词，后面的动词要用doing形式，后面的主语the robber与surround之间是被动关系，所以选择D
句意为，在被警察包围了几天之后，那个强盗最终屈服了