In zones where earthquakes are known to occur, ______ construction techniques can significantly reduce the effects of seismic wave.A.to improveB.improvingC.improvedD.being improving
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C解析考查非谓语动词。此处improved 作construction techniques的定语，建造技巧和提高之间是被动关系。句意为在一些地震频发的地区，改良的建造技巧可以显著地嫌少地震的影响、