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Though great progress has been made in astronomy in the past fifty years, ______ still much that rem
题目简介
Though great progress has been made in astronomy in the past fifty years, ______ still much that rem
题目详情
Though great progress has been made in astronomy in the past fifty years, ______ still much that remains mysterious to astronomers _______ the universe, even the solar system.
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A. It is; of B. there is; about C. It is; with D. there is; with
题目简介
Though great progress has been made in astronomy in the past fifty years, ______ still much that rem
题目详情
remains mysterious to astronomers _______ the universe, even the solar system.
B. there is; about
C. It is; with
D. there is; with
答案