单项选择题

A．in
B．on
C．at
D．to
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单项选择题
A．in whichB．from whichC．of whichD．by which
A．in which
B．from which
C．of which
D．by which
单项选择题
A．chanceB．timeC．momentD．occasion
A．chance
B．time
C．moment
D．occasion
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