单项选择题

It is well known that knowledge is the ______ condition for expansion of mind.

A．incompatible
B．incredible
C．indefinite
D．indispensable
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单项选择题
The International Monetary Fund has done a lot to ______ the exchange rate and to ease the problems of the member countries with deficit.
A．mobilize
B．minimize
C．stabilize
D．generalize
单项选择题
It is ______ whether Sam will come to attend his best friend's funeral as he has taken the town's money and made off with it.
A．suspicious
B．doubtful
C．dubious
D．unquestionable
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