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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单项选择题

One more try,（）you will succeed.

A. and
B. but
C. or
D. so

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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