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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单项选择题
Water is to fish _______ air is to man.
A．that
B．which
C．what
D．how
单项选择题
Women are often said to be more _______ than men.
A．liable
B．identical
C．emotional
D．immense
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