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I always ______ my childhood as the happiest time of my life.
A、look out for
B、look back on
C、look forward to
D、look around for
【正确答案】：B
【题目解析】：look out for：当心、提防，留心防备；look back on：回首（往事），回忆，回顾；look forward to盼望，期待；look around for：到处寻找。根据句意可知，选B。