单项选择题

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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单项选择题

The conference（）a full week by the time it ends.

A．must have lasted
B．will have lasted
C．would last
D．has lasted

单项选择题

（）evidence that language-acquiring ability must be stimulated.

A．If being
B．It is
C．There is
D．There being

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