单项选择题

A．active
B．ignored
C．inactive
D．useless
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单项选择题
A．in whichB．at whichC．of whichD．under which
A．in which
B．at which
C．of which
D．under which
单项选择题
A．whatB．asC．thatD．which
A．what
B．as
C．that
D．which
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