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. [ ]A. It is; of B. there is; about C. I 题目和参考答案——青夏教育精英家教网——

题目内容

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.

[ ]

A. It is; of
B. there is; about
C. It is; with
D. there is; with

B

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