So that modern industry cannot develop without it.
A. electricity is important
B. important is electricity
C. electricity important is
D. important electricity is
网友回答
A. electricity is important
(答案→)B. important is electricity
C. electricity important is
D. important electricity is
解析：考查全部倒装。so...that句型中，当so位于句首时，应该用全部倒装。即把谓语提到主语前。排除C、D；so后紧接形容词，排除A。故选B。