I haven’t read the book for long I’ve forgotten what it is about.
A. such; that
B. so; as
C. so; that
D. such; as
网友回答
A. such; that
B. so; as
(答案→)C. so; that
D. such; as
解析：本题的含义是这本书我已经很长时间没看了，以至于我忘记了书的有关内容，so后跟形容词与that结果状语从句搭配，表示如此……以至于的意思，符合本题的含义，故本题选C。