摘要： 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
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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
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