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    精英家教网 > 高中英语 > 题目详情
    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
    D
    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。
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