2. 外语
  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 时态。challenge意为“挑战，怀疑”，常用作及物动词。本句中牛顿的观点受到挑战为一个当前已经发生的事实，故采用现在完成时的被动语态。
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