I have made ______ clear ______ I have nothing to do with the accident. A: it... who B: it... that C: this... who D: this... that

3G（第三代移动通信系统）最早1985年由国际电信联盟（IT...（国际移动电信-2000）的含义是（）。

I can't afford that dress. It... A: is less expensive than the other one. B: is too expensive. C: isn't expensive enough. D: isn't pretty.

可以是产品支持与专业服务的组合，用于向客户提供IT...的组建和管理、信息技术培训和支持服务等。