单项选择题

Passengers are offered money to ______ their seats when planes are overbooked.

A．vault
B．vacate
C．wield
D．vouchsafe
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单项选择题
He was stabbed with a bayonet by his enemy.
A．spade
B．rifle
C．dagger
D．spear
单项选择题
______ to speak when the audience interrupted him.
A．Hardly did he begin
B．No sooner had he begun
C．Not until be begun
D．Scarcely had he begun
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