单项选择题

The ______ of some industries depends on lots of advertisements.

A．perception
B．prospect
C．prosperity
D．property
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单项选择题
Although we are not sure why we sleep, there is no doubt ______ we need to do so.
A．whether
B．why
C．what
D．that
单项选择题
The police arrived at the spot, ______ the situation became calmer.
A．before which
B．in that
C．for that
D．after which
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