单项选择题

A．intervals
B．times
C．occasions
D．circumstances
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单项选择题
A．foreverB．previouslyC．formerlyD．constantly
A．forever
B．previously
C．formerly
D．constantly
单项选择题
A．happenB．coverC．exitD．travel
A．happen
B．cover
C．exit
D．travel
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