构成:主语+ shall/will have been doing
I shall have been working here in this factory for twenty years by the end of the year.到今年年底,我将在这个工厂工作20年了
构成:主语+ shall/will have been doing
I shall have been working here in this factory for twenty years by the end of the year.到今年年底,我将在这个工厂工作20年了