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Since 2003,China,together with five other countries,   (try) to help solve the nuclear(核) problem i...

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that; since    since; 不填    when; that    since; that  
have taken place; was founded    has taken place; was founded    have been taken place; founded    took place; founded  
coping    containing    confirming    committing  
As        It        That        What  
2 years ago  for 2003  since she come here  since 2 years ago  
A.before  until  while  since  
has lived    have lived    lived    lives  
of   to   for   about  
since    for    in    until  
was found    founded    was founded    found  
after  before  when  since  
How soon, comes    How often, got    How long, came    How far, arrived  
in; since    of; since    in; until    of; until  
When, a lot  As, a bit  Since, a lot  Since, a lot of  
For    Since    From    Before  
is belonged    have belonged    are belonging    belonged  

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