GWD15 SC!!! 比较问题求解！！

cinderellahjy

[size=9.000000pt]According to analysts, an alliance between three major personal computer companies and most of the nation’s largest localtelephone companies would enable customers to receive internet data over regular telephone lines with speeds much higherthan is currently possible.
                                       

                                       
• with speeds much higher than is
• with speeds that are much higher than are
• at much higher speeds as are                                       
• at much higher speeds than that
• at speeds much higher than are    答案为E  请问are在这里作什么成分？
• 
  

                                
                        
               

TwinkleG

个人理解，补全句子：
According to analysts, an alliance between three major personal computer companies and most of the nation’s largest localtelephone companies would enable customers to receive internet data over regular telephone lines at speeds much higher than are (the speeds of regular telephone lines) currently possible.

比较的是telephone lines的speeds，有Agreement的要求所以选are；至于are做什么成分实在不知道，不过对于我这种渣渣来说能选就行了....实在不懂是什么成分，帮顶