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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、aretochallenge
B、maybechallenged
C、havebeenchallenged
D、arechallenging
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正确答案:

C

答案解析:

【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。

【难点】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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