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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专业英语四级

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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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