Though great progress has been made in astronomy in the past fifty years, ______ still much that remains mysterious to astronomers ______

◎ 题干

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

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◎ 解析

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