83. 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（A）
(E) radically altered the investment strategies of United States and
难道这里就不怕引起歧义, 把have altered的主语和those of foreign corporations进行比较, 虽然逻辑上不会产生歧义, 可语法上会, 也是GMAT力求避免的吧
还有个例子
8. Today’s technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.
(A) small cars more fuel-efficient now than at any time in their
(B) small cars that are more fuel-efficient than they were at any time in their
(C) small cars that are more fuel-efficient than those at any other time in
(D) more fuel-efficient small cars than those at any other time in their（C）
(E) more fuel-efficient small cars now than at any time in
想起我以前与此有关的一个帖子, 没有得到解决的, 也请大家帮着看看.
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=77723
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