this book is so difficult .he can it understand it 同义句转换This book is _  _  _ _ to understand

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thisbookissodifficult.hecanitunderstandit同义句转换Thisbookis_ _ _ _tounderstandthisbookissodifficult.hec

this book is so difficult .he can it understand it 同义句转换This book is _  _  _ _ to understand
this book is so difficult .he can it understand it 同义句转换
This book is _  _  _ _ to understand

this book is so difficult .he can it understand it 同义句转换This book is _  _  _ _ to understand
This book is too difficult for him to understand