单项选择题

_______ is often the case with a new idea, much preliminary activity and optimistic discussion produce no concrete proposals.

A．As
B．That
C．Which
D．What
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His book has made a great impact _______ its readers.
A．at
B．for
C．to
D．on
单项选择题
The paper _______ several persons are risking their lives is an important report on missiles.
A．after which
B．for which
C．with which
D．at which
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