单项选择题

His letter was in such a casual scrawl and in such pale ink that it was ______

A．doubtful
B．ambiguous
C．obscure
D．illegible
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单项选择题
Based on the ______ that every business is now free to formulate its own strategy in light of the changing market, I would predict a market improvement in the efficiency of China's economy.
A．guidance
B．instruction
C．premise
D．eminence
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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