单选题
In recent years, TCP/IP has also begun to be used by telephone companies to provide faster, cheaper telephone
(67)
A、
transmitting
B、
transmited
C、
transfers
D、
transmissions
【正确答案】
D
【答案解析】
[分析] 最近几年，TCP/IP已经被电信公司使用为用户提供更快速、更廉价的电话通信。
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