这是单选题吗? C和D都对吧?

正：Country girl though she is, she has the manners of a lady.

正：Country girl as she is, she has the manners of a lady.

不过，这类用法不能用 although：

误：Country girl although she is, she has the manners of a lady.

更多例句：

Bravely though / as they fought, they had no chance of winning.

Disgusting though / as it looked, it was actually quite tasty. 

Frightened though / as she was, she forced herself to pick up the snake.

Scarce though / as food became, they always found enough to share with me.

Confident though / as she felt, she knew the examination would not be easy. 

Confident though / as she felt, she knew the examination would not be easy. 

Successful though / as their new products have proved, the company is still in financial difficulties. 

这道题应该选C。

因为Country girl是名词，所以后面必须用though, 不能用as，而且名词不用冠词。只有前面为形容词/副词的情形下，后面的as/though才可以互换。所以A、B、D是错的。

斯旺的《牛津英语用法指南》（第四版，2016）第255词条有相关解释：

255 as and though:

After a noun, though can be used in this way (but not as).

该书例句：Scot though she was, she supported the English team

                   Cold as/though it was, we went out. (= Although it was very cold,...)

                   Bravely as/though they fought, they had no chance of winning.

另外，WR论坛母语的人也有相似解答：

https://forum.wordreference.com/threads/boy-as-he-is-he-looks-old.2325871/

表示“虽然”的连词as和though都可以引导让步状语从句，放在作表语的名词后面（从英英词典和英汉词典中可以查到有关的例句）。所以，C. Country girl though she is 和 D. Country girl as she is,都应该是正确的。但是，《牛津英语用法指南》第四版认为，在这种用法中， “as 不可以”用在名词之后。（详见255节）因此，如果作为单项选择题，命题人提供的答案应该是C. Country girl though she is。