Great as Newton was, many of his ideas______ today and are being modified by the

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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

解析根据句意，所填空应使用被动语态，因此首先排除[A]和[D]。[B]may be challenged和后半句中的are being modified相矛盾，故答案为[C]。

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