单项选择题

Royalty and a sense of responsibility are ______ to a stable marriage.

A．indispensable
B．inseparable
C．indirect
D．indisputable
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单项选择题
Everything in the universe undergoes ______ development and change.
A．continuous
B．continual
C．continued
D．constant
单项选择题
He said he liked traveling by train, but after six hours standing in the corridor, he changed his ______.
A．sound
B．voice
C．tone
D．tune
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