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
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(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。