求助一道白勇语法大全里的题。

veryglad2cu

Computers are becoming faster, more powerful, and more reliable, and so too are modems,they are the devices to allow two or more computers to share information over regular telephone lines.
最后一个选项E是：also modems， which are the devices to allow,解释是不能构成平行结构。要跟谁平行啊？不懂~如果说是跟and前面的内容平行的话，那么他给出的正确选项，B：so too are modems， the devices that allow，这也是个从句啊~~~~也不平行啊~~~~~~

我好迷惑。求解释。

evilleo

modems 是和computers 平行的吧。 后边的devices是modems的同位语。而且我认为E选项里的to alow不恰当，因为没有表示目的的意思。

myheronash

modems和computers平行吧。
Computers are ...,and so too are modems.