问题补充:
I have no idea the book is to your English study.
A. whether, of great value
B. if , of great value
C. that , so value
D. how , very valuable
答案:
(答案→)A. whether, of great value
B. if , of great value
C. that , so value
D. how , very valuable
解析:考查从句和固定用法。同位语从句Whether the book is of great value解释idea的内容。第二空Of great value=valuable. of+名词=该名词转换成的形容词。