问题补充：
it is, the boy never seems to be able to finish it off.
A. However interesting a book
B. Whatever interesting a book
C. How interesting a book
D. What an interesting book
答案：
(答案→)A. However interesting a book
B. Whatever interesting a book
C. How interesting a book
D. What an interesting book
解析：答案：A考查特殊句式和状语从句。句意为：不管这本书多么有趣，那个孩子看起来是绝不会把它看完的。感叹句的词语排列顺序为：how＋形容词＋冠词＋可数名词单数＝what＋冠词＋形容词＋可数名词单数。根据句意可知，此处表示“不论到什么程度，不管”，故应用however，故答案A符合语境。
