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

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

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

单项选择题

Jack's father suggested that Jack（）in London for a few more days.

A．would stay
B．stay
C．had stayed
D．stayed

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