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．have challenged
C．a(chǎn)re challengingD．have been challenged
D
challenge同ideas之間存在被動關(guān)系。句子表“當(dāng)年牛頓的許多想法受到了質(zhì)疑”之意。
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