问题补充:
单选题
When he looked up,he suddenly found himself________by a group of teenagers,________looked at him anxiously.A.to be surrounded;whichB.surrounded;whoC.be surrounded;whoD.having been surrounded;which
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B解析考查分词用法和定语从句。Him与surround构成被动关系,所以使用过去分词。第二空who指代先行词a group of teenagers在句中做主语。句意:当他抬头看的时候,突然发现自己被一群年轻人包围着,这群年轻人焦急地看着他。