IP addresses are the unique sequence of numbers to each puter, websites or other Internet-connected devices.
A. to assign
B. assigning
C. assigned
D. being assigned
网友回答
A. to assign
B. assigning
(答案→)C. assigned
D. being assigned
解析：考查非谓语动词。numbers和assign是动宾关系，用过去分词表示被动、完成；相当于定语从句which are assigned to...。句意：IP地址是分配给每台电脑、网站或其它互联网装置的一串特殊的数字。故选C。