单项选择题


A．relation
B．history
C．background
D．correlation
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单项选择题
A．at whichB．whenC．thatD．during which
A．at which
B．when
C．that
D．during which
单项选择题
A．takeB．putC．getD．hold
A．take
B．put
C．get
D．hold
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