问题
选择题
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
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。