the number of Chinese living past 100 has more than doubled in the pastsix years,_a record high of 360,000 people in 2013.a.have reached b.reaching c.to reach d.to be reaching

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the number of Chinese living past 100 has more than doubled in the pastsix years,_a record high of 360,000 people in 2013.a.have reached b.reaching c.to reach d.to be reaching

the number of Chinese living past 100 has more than doubled in the pastsix years,_a record high of 360,000 people in 2013.a.have reached b.reaching c.to reach d.to be reaching
the number of Chinese living past 100 has more than doubled in the past
six years,_a record high of 360,000 people in 2013.
a.have reached b.reaching c.to reach d.to be reaching

the number of Chinese living past 100 has more than doubled in the pastsix years,_a record high of 360,000 people in 2013.a.have reached b.reaching c.to reach d.to be reaching
现在分词结构 相当一个状语从句 ,
没有被动或过去的含义,
也没有一次性的含义,
但具备持续进行的状态,
所以 用B reaching

B.reaching

选择B. 是分词作状语。