求助大全166

meckychen

1.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
Ans：B
Why？
Thanks

pterosaur

, an industry marked by rapid innovation and volatile demand, 是插入语，去掉后看。because of 引导的是从句而不是主句，而 such firms 明显是有特指，所以前面应该出现过 firms。