为什么用have covered 而不用covers You won ’ t find the book interesting until you have covered the first charter

分类: 作业答案 • 2021-12-20 03:02:30

问题描述：

为什么用have covered 而不用covers
You won ’ t find the book interesting until you have covered the first charter

答

have covered 是一个过去完成时态,
因为对于你来说,看完这本书,这个状态永远都是多去完成时