单项选择题

Great as Russell was, many of his ideas ______ today and are being modified by the work of philosophers of our time.

A．are to challenge
B．may be challenged
C．have been challenged
D．ale challenging
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单项选择题
Above the trees are the hills, ______ magnificence the river faithfully reflects on the surface.
A．where
B．of whose
C．whose
D．which
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