GWD-15-1疑问求解，谢过先

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.      at speeds much higher than are

为什么答案B不可以呢？

因为speed此字介系词一定是with，

对呀，那为什么答案是E,介词用的是at

另外E中是不是把than后面的主语省略了？可以这样表达的吗？at speeds much higher than (those) are currently possible