18. 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.
(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（B）
(E) also modems, which are the devices to allow
为什么不能选e呢？
modems与 Computers 并列，在此句中，and后必须是个句子（或省略相应成分的）。
你将e中的]which从句拿走，自然会发现问题。
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