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After________ by the police for several days,the robber had

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