单项选择题

A．known
B．defined
C．called
D．referred to
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单项选择题
A．made up ofB．consisted ofC．constituted ofD．made from
A．made up of
B．consisted of
C．constituted of
D．made from
单项选择题
A．on thatB．on whichC．at thatD．at which
A．on that
B．on which
C．at that
D．at which
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