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

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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