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

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GreatasNewtonwas,manyofhisideas______todayandarebeingmodifiedbythe