单项选择题

A．up
B．on
C．off
D．ont
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单项选择题
A．intervalsB．timesC．occasionsD．circumstances
A．intervals
B．times
C．occasions
D．circumstances
单项选择题
A．foreverB．previouslyC．formerlyD．constantly
A．forever
B．previously
C．formerly
D．constantly
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