I have no idea____________ the book is __________ to your English study.A.whether, of great valueB.if , of great valueC.that , so valueD.how , very valuable
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A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。