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18、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

18、B

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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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