单项选择题

Great as Russell was, many of his ideas ______ today and are being modified by the work of philoso phers 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
A new theory of the origin of language is the most ______ feature of the book.
A．conspicuous
B．prominent
C．arresting
D．striking
单项选择题
Every member of the original cast was signed ______ her.
A．in addition to
B．except
C．except for
D．besides
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