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— Do you know about China’s Bei Dou Navigation Satellites system (北斗卫星导航系统)? — Yes. So far, China __...
题目内容：
— Do you know about China’s Bei Dou Navigation Satellites system (北斗卫星导航系统)?
— Yes. So far, China ________ up 43 Bei Dou Satellites (卫星) successfully.
A.sent B.is sending C.has sent
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