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China sent up the final satellite of Bei...

China sent up the final satellite of Beidou Navigation Satellite System(北斗卫星导航系统) from Xichang Satellite Center___________ June 23,2020.

A.at B.in C.to D.on

 

D 【解析】 句意:中国于2020年6月23日从西昌卫星中心发射了北斗卫星导航系统的最后一颗卫星。 考查介词辨析。at后接具体的时刻;in后接年、月、世纪等,或泛指的上午、下午、晚上;to到,一般与from连用,表时间范围;on后接具体的某一天。句中“June 23,2020”表具体的一天,故其前应加介词on,即中国于2020年6月23日发射卫星。故选D。  
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