GWD-18-41

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.

1. covering as much as 90
        percent of Thailand
        and accommodating as many as 300,000 elephants, a third of them
2. covering as much as 90
        percent of Thailand
        accommodated as much as 300,000 elephants, and a third of them were
3. covered as much as 90 percent
        of Thailand
        and accommodated as much as 300,000 elephants, with a third
4. covered as much as 90 percent
        of Thailand
        and accommodated as many as 300,000 elephants, a third of them
5. covered as much as 90 percent
        of Thailand
        and accommodating as many as 300,000 elephants, with a third of them

cover 和 accomodate的动作主体都是forest，所以两者应该同时用一般过去时构成动作并列。

不是应该用a third of which吗？  怎么能用them？  我总记得中学的时候就是这样教的，因为之前有个逗号，所以之后要用定语从句~~~~~

请教NN   谢谢了

a third of them 是独立主格结构，所以不用谓语；如果用a third of which后面就要有谓语了

仔细看各选项，E 是accommodating, C是
            as much as.

NN 们啊  不是太理解. 如果是独立主格结构结构 那它应该修饰的是动词accommodate吧？  怎么理解呢