og181

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。

1. 所有格指代的问题

's所有格后，such firms无指代对象（本应该指代fims）

A of B ,B仍有可以被指代和修饰的资格

2. require的用法

It requires that ... 有...的必要

require sth. of sb. 对某人有...的要求

require sb. to do sth. 要求某人做某事

偶觉得REQUIRE只有解释为需要时，才用require sth的结构，of sb to do sth.是带逻辑主语的不定式，在这个句子中用来表示目的。

当require解释为要求的时候，只能用require sb. to do sth.  或者require that