I borrowed several books from the library, are about English study.
A. two of them
B. and two of which
C. two of which
D. two of what
网友回答
A. two of them
B. and two of which
(答案→)C. two of which
D. two of what
解析：句意：我在图书馆借了几本书，其中两本是关于英语学习的。这里使用了定语从句，先行词是books，定语从句中缺少的是two of the books，所以用two of which引导定语从句。选C。