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题目
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Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.
A.are to challenge B.have challenged
C.are challengingD.have been challenged

答案
D
解析
challenge同ideas之间存在被动关系。句子表“当年牛顿的许多想法受到了质疑”之意。
核心考点
试题【Great as Newton was, many of his ideas_____today and are being modified by the w】;主要考察你对一般现在时等知识点的理解。[详细]
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