Great as Newton was, many of his ideas______today and are being modified by the work of scientists of our time.

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问题 Great as Newton was, many of his ideas______today and are being modified by the work of scientists of our time.

选项 A、are to challenge
B、may be challenged
C、have been challenged
D、are challenging

答案C

解析 根据句法知识,此处需要一被动语态,从后面的are being modified可排除B。
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