I had to pay 1000 dollars for this Pearl River band piano.

题目

I had to pay 1000 dollars for this Pearl River band piano.
It's probably ______________.
为什么用worth it 而不用worth?

答案

worthy才是形容词
回答里是it's 明显要表语
worth sth/it/doing
而且这个不是it的用法
而是worth 的用法