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.
[     ]
A. It is; of  
B. there is; about  
C. It is; with  
D. there is; with
题型:单选题难度:中档来源:同步题

答案

B

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