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

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

出自：三门峡职业技术学院英语读写

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