单项选择题

____ a serious crime， what exactly should you do

A．Unless you witness
B．If you were to witness
C．If only you witness
D．since you witness
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单项选择题
The government is making every effort to ____ an economic crisis， but it seems nothing could help.
A．eliminate
B．avert
C．impede
D．swerve
单项选择题
Until a firm agreement has been reached， I am not ____ to accepting the offer.
A．accustomed
B．dedicated
C．committed
D．entitled
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