In zones where earthquakes are known to occur, ______ construction techniques can significantly reduce the effects of seismic wave.


  1. A.
    to improve
  2. B.
    improving
  3. C.
    improved
  4. D.
    being improving
C
考查非謂語動(dòng)詞。此處improved 作construction techniques的定語，建造技巧和提高之間是被動(dòng)關(guān)系。
句意為在一些地震頻發(fā)的地區(qū)，改良的建造技巧可以顯著地嫌少地震的影響、
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