FromApril1,2009,3Gmobilephones

问题详情：

From April 1, 2009, 3G mobile phones ______ in 8 main cities in China ________of what is going on all over the world faster and more conveniently..

   A. are used; to keep informed              B. have come into use; to keep people informed

   C. come into use; keeping informed     D. have been in use; informed

【回答】

知识点：其他

题型：选择题