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信息发布者：
past
present
just
used to
past and present 
an hour ago
used to do sth.
share food with me
go to school by bike
wait for the next one
at different times
have
you
seen
I've
just
eaten
You've 
changed
used
to
share
How
go
to
school
used
to
by
bike
since
ever
northern
north
married
marry
wife
block
over
pollution
factory
waste
realize (=realise )
improve
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