he asked me to borrow a book for him ,one about how to be a good volunteer为何用ONE

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he asked me to borrow a book for him ,one about how to be a good volunteer为何用ONE

he asked me to borrow a book for him ,one about how to be a good volunteer为何用ONE
he asked me to borrow a book for him ,one about how to be a good volunteer为何用ONE

he asked me to borrow a book for him ,one about how to be a good volunteer为何用ONE
“borrow a book”这里泛指一本书,“一本如何成为一名优秀志愿者的书”;book可数,故用one来指代book避免重复.
that用于指代不可数名词;
it指代前面提到的同一个事物.

代替a book

他要我帮他借了一本书,一个关于如何成为一个好志愿者为何用一

指代上文提到的名词,用WHICH应该也是可以的,因为是非限定性定语从句