单项选择题

During examinations candidates are always supposed to stay in seats， keep their eyes on the work， ____ to anyone.

A．and not speak
B．but could not speak
C．rather than speak
D．instead of speaking
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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
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
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