181. Because of the enormous research and
development expenditures required to survive in the electronics
industry, an industry marked by rapid innovation and volatile demand,
such firms tend to be very large.
(A) to survive
(B) of firms to survive
(C) for surviving
(D) for survival
(E) for firms' survival
为什么E是错的？required可以作分词修饰expenditures,也就是expenditures (which are) required for firm's survival 应该可以的呀。
另外，require 到底怎么用呀？大家帮帮我呀。 | 
