题目内容

When he looked up, he suddenly found himself       by a group of teenagers,
      looked at him anxiously.
A.to be surrounded; whichB.surrounded; who
C.be surrounded; whoD.having been surrounded; which
B
考查非谓语动词及定语从句。第一空考查过去分词作宾语补足语,表示“发现自己被包围”;who引导非限定性定语从句,指代先行词teenagers。故选B。
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