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In August 1977, a satellite _______ to gather data about the 10 million black holes which are thought to be in the Milky Way.
In August 1977, a satellite _______ to gather data about the 10 million black holes which are thought to be in the Milky Way.
A.launched
B.was launched
C.has been launched
D.is launched
正确答案是B
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