请教语法题

qsxx1925

请教一道题:

At the turn of the twentieth century, forest covering as much as 90 percent of Thailand and accommodating as many as 300,000 elephants, a third of them domesticated and performing various essential tasks.

• A. covering as much as 90 percent of Thailand and accommodating as many as 300,000 elephants, a third of them
• B. covering as much as 90 percent of Thailand accommodated as much as 300,000 elephants, and a third of them were
• C. covered as much as 90 percent of Thailand and accommodated as much as 300,000 elephants, with a third
• D. covered as much as 90 percent of Thailand and accommodated as many as 300,000 elephants, a third of them
• E. covered as much as 90 percent of Thailand and accommodating as many as 300,000 elephants, with a third of them
  

答案远D. 不理解其中一个语法点，最后句尾的performing是什么语法功能?谢谢指教！

RyanR

，a third of them domesticated and performing various essential tasks. 这是一个独立主格形式，performing是修饰them (elephants)的，表示them主动发出的动作。

qsxx1925

那and 前后不用平行吗？Ved和Ving不平行呀

RyanR

qsxx1925 发表于 2016-7-6 09:55
那and 前后不用平行吗？Ved和Ving不平行呀

不用的，两个都是做修饰可以平行

云杉之歌

domesticated  performing 一个是被动发出的动作一个是主动发出动作，可以放在一起的

qsxx1925

谢谢各位NN的指教