马上快要考试了，急问真题一道 “speeds much higher"..

马上快要考试了，急问真题一道： 选D还是E？ 大家意见？

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

我也认为是E。 D的that的指代不清。 如是指speeds似乎该用those.

应该是D

an alliance would enable customers to receive Internet data over regular telephone lines at much higher speeds than that currently possible.

that 指代speed,并不一定要复数与复数比较, eg. Yesterday, i ate an apple much bigger than the apples i ate before

看E:  an alliance enable customers to receive at higher speeds than are currently possible.  
有are的话，就是比较alliance了