foregone conclusion
noun [ C usually singular ] uk/ˌfɔː.ɡɒn kənˈkluːʒən/ us/ˌfɔːr.ɡɑːn kənˈkluːʒən/
预料中的必然结局
a result that is obvious to everyone even before it happens
The result of the election seems to be a foregone conclusion. 选举结果似乎已成定局。