Great as Newton was, many of his ideas ____ today and are being modified by the work of scientists o

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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.

A. are to challenge

B. may be challenged

C. have been challenged

D. are challenging

参考答案:

C

【句意】尽管牛顿非常伟大,然而他的许多观点当前正受到怀疑,并且当今的许多科学家正在努力对这些观点进行修正。

英语考试