Robert failed three times () he finally reached the North PoleA until B before是因为如果用until的话,前面要加not 原因,才选before的吗

分类: 作业答案 • 2022-04-14 12:54:59

问题描述：

Robert failed three times () he finally reached the North Pole
A until B before
是因为如果用until的话,前面要加not 原因,才选before的吗

答

是的.如果用until前面改否定