This book is ( ) to our English study ( )用help ,并说明理由

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This book is ( ) to our English study ( )用help ,并说明理由
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This book is ( ) to our English study ( )用help ,并说明理由
This book is ( ) to our English study ( )用help ,并说明理由

This book is ( ) to our English study ( )用help ,并说明理由
答案 helpful

be helpful to