InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.-查字典考试网

InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.

A、launched
B、waslaunched
C、hasbeenlaunched
D、islaunched

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