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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.

1. with speeds much higher than is
2. with speeds that are much higher than are
3. at much higher speeds as are
4. at much higher speeds than that
5. at speeds much higher than are

我不知道答案E中的are对应前面哪个动词？

搜了所有讨论都说是 at speeds much higher than（speeds）are currently possible

但是前面是名词和后面的句子比，这种比较形式是错误的呀。

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

偶觉得应该是这样省略了。不是句子，还是名词speeds。

晕，介个不对吧，哪有定语从句省略主语和that而补出be动词的,怎么说不过去

你总不能说 the boy are tall省略了who相当于the boy who are tall吧。

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

大全919 No less remarkable than the development of the compact disc has been the use of the new technology to revitalize, in better sound than was ever before possible(in sound (thatt is) better than was ever before possible),  some of the classic recorded performances of the pre-LP era.

嗯，也只能这样解释最合理了，谢谢各位

原来是这样的。