Great as Newton was，many of his ideas____today and are being modified by the

  work of scientists of our time.

  A．a(chǎn)re to challenge      B．may be challenged

  C．have been challenged  D．a(chǎn)re challenging

C


解析:

考查時(shí)態(tài)。牛頓的觀點(diǎn)一直面臨著挑戰(zhàn)。

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