比较级还原问题！

Xiaotongdi

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
   这题答案是E！我想知道比较级还原之后是什么呢？
   还有，语法题好像有个大规律，一般都和原句比较像！是不是这样的呢？如果做到脑子不转的时候，这个方法能不能用的上？最近发现语法到达瓶颈并开始退步，咋办咋办？
   

Xiaotongdi

谁来帮帮忙解答一下？

棒棒dudu

我想are 是针对前面的higher 来说的， 补出这个are 就是为了是比较对象更加明确