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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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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Travelers in space have to ______ many discomforts in their spaceships.
A．maintain
B．persist
C．endure
D．sustain
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