单项选择题

We should always keep in mind that ____________decisions often lead to bitter regrets.

A． urgent
B． hasty
C． instant
D． prompt
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单项选择题
The professor can hardly find sufficient grounds ________________ his argument in favor of the new theory.
A． which to base on
B． on which to base
C． to base on which
D．which to be based on
单项选择题
_______________is generally accepted, economical growth is determined by the smooth development of production.
A．What
B．That
C． It
D． As
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