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Once harm ______ to the environment, it takes years to have the system recovered.


  1. A.
    does
  2. B.
    is done
  3. C.
    will be done
  4. D.
    be done
B
考查时态。Once引导条件状语从句,用一般现在时代替将来时,主句用将来时。句意:一旦破坏环境的行为被做出,环境系统要花很多年才能恢复。
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