单项选择题

A．Whenever they go.
B．When on normal duty.
C．When chasing an armed criminal.
D．When chasing a criminal they know.
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单项选择题
A．Many people who are in need work in it.B．The hospital blood is mainly provided by it.C．Anyone can get help from it.D．It covers nearly the whole world.
A．Many people who are in need work in it.
B．The hospital blood is mainly provided by it.
C．Anyone can get help from it.
D．It covers nearly the whole world.
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