InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMi
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InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.
A.launched
B.waslaunched
C.hasbeenlaunched
D.islaunched
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