425.Increases in the cost of energy, turmoil in the international money markets, and the steady erosion of the dollar have altered the investment strategies of United States corporations more radically than those of foreign corporations. (A) altered the investment strategies of United States corporations more radically than those of (B) altered the investment strategies of United States corporations more radically than (C) altered the investment strategies of United States corporations more radically than they have (D) radically altered the investment strategies of United States corporations more than (E) radically altered the investment strategies of United States and E错在哪里呢?还有,正确答案A补全以后是than they altered those of foreign corporations吗?如果是的话为什么这个they alter可以省略呢?