The book came out last month ,but( has sold out) already .为什么不用has been sold out?

问题描述:

The book came out last month ,but( has sold out) already .为什么不用has been sold out?

有些动词规定是用主动形式,这个得靠你平时积累,自己看到就记住,背出来
类似的有 smell
The flower smell good.而不说The flower is smell good.