thE Country hAs AlrEADy sEnt up thrEE unmAnnED spACECrAFt, thE most rECEnt ______ At thE EnD oF lAst mAy.
A. hAs BEEn lAunChED
B. hAving BEEn lAunChED
C. BEing lAunChED
D. to BE lAunChED