this book cost me 10 yuan.(改为同义句)

问题描述:

this book cost me 10 yuan.(改为同义句)
I ____ 10 yuan _____ this book.
I ____ 10 yuan _____ this book.
I ____ 10 yuan _____ _______ this book.

1 paid ,for
2 spent ,on
3 spent ,in buyingwhy ?really?答案绝对正确。PAY与SPEND 的主语都是人,但它们搭配的介词不同,且是固定用法