单项选择题

 Living in the desert involves a lot of problems, _____ water shortage is the worst.

A．not to mention
B．of which
C．let alone
D．for what
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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
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
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