This kind of book is very popular.It (sell) out in an hour适当形式答案是was sold但为什么不是will be sold呢?不是有in an hour表示将来吗?

问题描述:

This kind of book is very popular.It (sell) out in an hour适当形式
答案是was sold但为什么不是will be sold呢?不是有in an hour表示将来吗?