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【题目】— 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.sentB.is sendingC.has sent

【答案】C

【解析】

句意:——你知道中国的北斗卫星导航系统吗?——知道。迄今为止,中国已成功发射了43颗北斗卫星。

考查动词时态。sent一般过去时;is sending现在进行时;has sent现在完成时。根据关键词So far可知,本句为现在完成时。故选C

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