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Once ________, nothing can be feared.


  1. A.
    understand
  2. B.
    understood
  3. C.
    to understand
  4. D.
    to be understood
B
解析:此句意思是“一且懂得了,什么事情都个可怕”。once understood是once it is understood的省略,用过去分词understood表示被动。
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