单项选择题

Despite _______ efforts, the firemen were unable to save the house.

A．vacuous
B．vanilla
C．valiant
D．vagrant
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单项选择题
Travis hopes to be _______ from hospital next month.
A．discharged
B．dismissed
C．expelled
D．resigned
单项选择题
He was appointed chairman of the department in _______ to Mr. Chan.
A．recession
B．succession
C．confession
D．concession
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