Ihavenoidea

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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

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。