单项选择题

The doctors have tried very hard rescuing from the vital brain damage, but all their efforts went __________.

A．in vain
B．in no way
C．without effect
D．without fail
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单项选择题
The prospect of increased prices has already __________ worries.
A．provoked
B．irritated
C．inspired
D．hoisted
单项选择题
Feeling threatened, companies responded by writing ever-longer warning __________, trying to anticipate every possible accident.
A．symbols
B．labels
C．signals
D．marks
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