Leaders from different parts of the world took part in the discussion the international treaty.
A.which leads to
B.leading to
C.led to
D.led to have
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B解析这题考查现在分词作定语,leading to修饰the discussion,相当于which led to…，A项的时态错误。句意是：来自世界各地的领导人参加促使国际条约的讨论。选B。