小弟请教下 11版 OG 18题

18. Computers are becoming faster，more poweful， 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.

(A)  so too are modems ，they are the devices to allow

(B)   so too are modems ，the devices that allow

(C)  so too modems ，the devices allowing

(D)  also  modems ，they are the devices that allow

(E) also  modems ，which are the devices that to allowing

 请问NN们 and 后+ so to 表示什么呀 （这里又没考到平行结构） 请问 C 与 D 的区别是什么哦 谢谢

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=150191&page=1这是这道题的讨论

http://forum.chasedream.com/dispbbs.asp?boardid=23&id=153179这是总结的讨论

谢谢你哦~ 我去看看