問題詳情
8. 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
(A)launched
(B)was launched
(C)has been launched
(D)is launched
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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