◎ 题干
Creat as Newton was, many of his ideas        today and are being modified by the work of scientists of
our time.    
[     ]
A.   have challenged        
B.   have been challenged    
C.have questioned      
D.   have been questioning
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Creat as Newton was, many of his ideastoday and are being modified by the work of scientists of our time.[ ]A.have challengedB. have been challengedC.have que…”主要考查了你对  【现在完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。