求教: 大全987 section 1 第6题

mylittlebird

6.A firm that specializes in the analysis of handwriting claims from a one-page writing sample that it can assess more than three hundred personality traits, including enthusiasm, imagination, and ambition.
(A) from a one-page writing sample that it can assess
(B) from a one-page writing sample it has the ability of assessing
(C) the ability, from a one-page writing sample, of assessing
(D) to be able, from a one-page writing sample, to assess
(E) being able to assess, from a one-page writing sample,

答案是D，我选的是A. 不明白A为什么不行。Claim that不是最常用的吗？Claim to be 也经常用，但D be able to 分得那么开，很怪的。请高人指点啊。
另外，为什么我的第6题和别人不一样呢？我搜了论坛的讨论，别人的第六题好像是我的第五题。是我用的版本和别人不一样么？谢谢!

mylittlebird

明白了，谢谢！

eveneven

C项为什么不对啊

zhijingya

怎么明白的~~~