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 |
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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 |