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
考查非謂語動(dòng)詞及定語從句。第一空考查過去分詞作賓語補(bǔ)足語，表示“發(fā)現(xiàn)自己被包圍”；who引導(dǎo)非限定性定語從句，指代先行詞teenagers。故選B。
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