新概念三册24课中的一句话---选择题

the only person i know who has a skeleton in the cupboard is George Carlton,and he is very proud of the fact。选择：。。。George Carlton,and it is_____ he is very proud of。A。the fact B。something C。that which D。what正确答案是B这道题为什么不选A?答：新概念英语原来并没有这些选择题的。是中国人后来编的。这原句意为:The only person i know who has a skeleton in the cupboard is George Carlton,and he is very proud of the fact。我所认识的唯一的在柜中藏骷嵝的人便是乔治-卡尔顿,并且他还为【此】感到非常自豪。现在将这句话的后一个分句进行换一种说法：The only person i know who has a skeleton in the cupboard is George Carlton,and 【it】 is ____ he is very proud of。A。the fact B。something C。that which D。what我所认识的唯一的在柜中藏骷嵝的人便是乔治-卡尔顿,而且【它】是他感到非常自豪的_____。其实上句中的it用得不太好。因为不知道【它】指代的是什么。是the skeleton还是“他在柜中藏有a skeleton”这个事实（the fact)?所以造成选择的困难。其实D也不错啊!改编过的,加了中国特色的选择题的新概念英语中的有些选择题,质量并不好,别去深究了。