In August 1977, a satellite to gather data about the 10 million black holes which are thought to be【单选题】

时间：2021-06-28 11:45:58 解答: 169 次

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：

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