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 (E) also modems, which are the devices to allow OG解释强调device不能用to allow,而用that allow 或allowing,这又是为什么?谢谢
[此贴子已经被作者于2006-7-22 18:39:29编辑过] |