In zones where earthquakes are known to occur, ______ construction techniques ca

题干

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

A．to improve

B．improving

C．improved

D．being improving

上一题下一题 0.4难度单项选择更新时间:2012-06-05 06:09:48

小学学科试题库

初中学科试题库

高中学科试题库