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

参考答案

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黑龙江省教育学院-电子线路及实验（专升本）

信阳师范学院-小学教育-大学英语(高起专)