[求助]gwd 21-1

uniqueness

According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive Internet data over regular telephone lines with speeds much higher than is currently possible.

A. with speeds much higher than is

B. with speeds that are much higher than are

C. at much higher speeds as are

D. at much higher speeds than that (E)

E. at speeds much higher than are

请问，D为什么错？

E是从下面的句子省略来的吗？：

at speeds (that are) much higher than are currently possible (speeds)

请NN和版主出手相助，谢谢！

lemonees

省略应该是

at speeds (that are) much higher than (speeds)　are currently possible这样才平行

D. at much higher speeds than that

E. at speeds much higher than are　ＤＥ的的比较对象不同，楼主仔细体会一下，如果用Ｄ的形式，那应该是at much higher speeds than at ......；而Ｅ只是对形容词high的比较。

uniqueness

多谢！

理解了～