题目内容
The 52nd and 53rd BDS satellites(北斗导航卫星)were _______into space in Xichang,China in 2019 .
A.given back B.sent up C.shown off D.taken away
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题目内容
The 52nd and 53rd BDS satellites(北斗导航卫星)were _______into space in Xichang,China in 2019 .
A.given back B.sent up C.shown off D.taken away