跪求GWD-21-Q1中 than 的解释

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

本题选择E，请问大侠，than后面的are currently possible. 怎么解释呢？are的逻辑主语应该是lines啊！

 data over regular telephone lines at speeds much higher than the speeds that  are currently possible.

这里其实不是考 than，而是考词语搭配。speeds 在这个语境必须用 at 而不能用 with。因为是 higher，所以要用 than 而不是用 as。那就只剩下 D 和 E 了。D 不是错，但是不顺。通常英语的定语如果长一点就放在名词后面更好。所以 at speeds much higher than 比 at much higher speeds than 通顺得多。

Than 后面一般是省略重复部份的。不省略就很古怪。这里把省略部份放回去就是 at speeds much higher than the speeds that are currently possible.  但是没有人这样写的，说就当然更加没有了。

 我昨天做这题, 这是我查到的解释.~~ 你参考吧