单项选择题

If the law and order _____, neither the citizen nor his property is safe.

A．are not preserved
B．have not been preserved
C．were not preserved
D．is not preserved
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单项选择题
The paper _____ several persons are risking their lives is an important report on missiles.
A．after which
B．for which
C．with what
D．at what
单项选择题
I advise you _____ of _____ out such a dangerous plan.
A．to stop to think...carry
B．to stop thinking...carrying
C．to stop thinking...carry
D．to stop thinking...to carrying
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