大全638

638、sec07-24 Several years ago the diet industry introduced a variety of appetite suppressants, but some of these drugs caused stomach disorders severe enough to have them banned by the Food and Drug Administration.

(A) stomach disorders severe enough to have them

(B) stomach disorders that were severe enough so they were

(C) stomach disorders of such severity so as to be

(D) such severe stomach disorders that they were（D）

(E) such severe stomach disorders as to be

我看不出E的错误在哪？请教

Please refer to

GMAT语法讨论链接总录  

我搜索过了，这道题讨论过一次，可是没说清楚我不明白的地方。请NN解答，谢谢！