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 challenged |
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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 challenged |
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