CAQ30:
Though subject to the same wild-animal control efforts that killed off almost all the wolves in North America over the past century, the coyote’s amazing ability of adapting to the presence of humans has enabled it to expend its range into Alaska and Central America.

• coyote’s amazing ability of adapting to the presence of humans has enabled it to expend its
• coyote, because of its amazing ability of adapting to the presence of humans, have been able to expand their
• coyote, because of its amazing ability to adapt to the presence of humans, has been able to expand its
• amazing ability of the coyote to adapt to the presence of humans have enabled it to expand the
• amazing ability of the coyote to adapt to the presence of humans has enabled it to expand the
  

答案是C，可以说说为什么不能选A吗？是不是前面“coyote's ability”造成后面it指代不清？

是的，那个 it 严格来说是指 ability 的，不能用来指定语里面的 coyote。

A 还有一样不好，就是主语太长。英文要写得好，就要把长的修饰语押后，最忌把修饰语像中文、德文那样堆在前面。C 就是把修饰语放在 relative clause 里面，那样读起来顺很多。

谢谢