After________ by the police for several days,the robber had to give in.

题目

After________ by the police for several days,the robber had to give in.
surrounded和being surrounded都可以吗?

答案

after是介词.介词后面的动词必须是动名词（-ing开头的动词）.surround是及物动词,后面应该有宾语.如果没有宾语就必须是被动语态.所以,你的句子就成了being surrounded.