单项选择题

One cannot be too careful, ______

A．can one
B．can he
C．can she
D．can they
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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
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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